Finite Math Examples

$(- 3, - 9)$ , $(6, - 6)$ , $(- 3, 2)$

Step 1

Use the standard form of a quadratic equation $y = a x^{2} + b x + c$ as the starting point for finding the equation through the three points.

$y = a x^{2} + b x + c$

Step 2

Create a system of equations by substituting the $x$ and $y$ values of each point into the standard formula of a quadratic equation to create the three equation system.

$- 9 = a {(- 3)}^{2} + b (- 3) + c, - 6 = a {(6)}^{2} + b (6) + c, 2 = a {(- 3)}^{2} + b (- 3) + c$

Step 3

Solve the system of equations to find the values of $a$ , $b$ , and $c$ .

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Step 3.1

Solve for $c$ in $- 9 = a {(- 3)}^{2} + b (- 3) + c$ .

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Step 3.1.1

Rewrite the equation as $a {(- 3)}^{2} + b (- 3) + c = - 9$ .

$a {(- 3)}^{2} + b (- 3) + c = - 9$

$- 6 = a \cdot 6^{2} + b (6) + c$

$2 = a {(- 3)}^{2} + b (- 3) + c$

Step 3.1.2

Simplify each term.

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Step 3.1.2.1

Raise $- 3$ to the power of $2$ .

$a \cdot 9 + b (- 3) + c = - 9$

$- 6 = a \cdot 6^{2} + b (6) + c$

$2 = a {(- 3)}^{2} + b (- 3) + c$

Step 3.1.2.2

Move $9$ to the left of $a$ .

$9 \cdot a + b (- 3) + c = - 9$

$- 6 = a \cdot 6^{2} + b (6) + c$

$2 = a {(- 3)}^{2} + b (- 3) + c$

Step 3.1.2.3

Move $- 3$ to the left of $b$ .

$9 a - 3 b + c = - 9$

$- 6 = a \cdot 6^{2} + b (6) + c$

$2 = a {(- 3)}^{2} + b (- 3) + c$

$9 a - 3 b + c = - 9$

$- 6 = a \cdot 6^{2} + b (6) + c$

$2 = a {(- 3)}^{2} + b (- 3) + c$

Step 3.1.3

Move all terms not containing $c$ to the right side of the equation.

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Step 3.1.3.1

Subtract $9 a$ from both sides of the equation.

$- 3 b + c = - 9 - 9 a$

$- 6 = a \cdot 6^{2} + b (6) + c$

$2 = a {(- 3)}^{2} + b (- 3) + c$

Step 3.1.3.2

Add $3 b$ to both sides of the equation.

$c = - 9 - 9 a + 3 b$

$- 6 = a \cdot 6^{2} + b (6) + c$

$2 = a {(- 3)}^{2} + b (- 3) + c$

$c = - 9 - 9 a + 3 b$

$- 6 = a \cdot 6^{2} + b (6) + c$

$2 = a {(- 3)}^{2} + b (- 3) + c$

$c = - 9 - 9 a + 3 b$

$- 6 = a \cdot 6^{2} + b (6) + c$

$2 = a {(- 3)}^{2} + b (- 3) + c$

Step 3.2

Replace all occurrences of $c$ with $- 9 - 9 a + 3 b$ in each equation.

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Step 3.2.1

Replace all occurrences of $c$ in $- 6 = a \cdot 6^{2} + b (6) + c$ with $- 9 - 9 a + 3 b$ .

$- 6 = a \cdot 6^{2} + b (6) - 9 - 9 a + 3 b$

$c = - 9 - 9 a + 3 b$

$2 = a {(- 3)}^{2} + b (- 3) + c$

Step 3.2.2

Simplify $- 6 = a \cdot 6^{2} + b (6) - 9 - 9 a + 3 b$ .

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Step 3.2.2.1

Simplify the left side.

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Step 3.2.2.1.1

Remove parentheses.

$- 6 = a \cdot 6^{2} + b (6) - 9 - 9 a + 3 b$

$c = - 9 - 9 a + 3 b$

$2 = a {(- 3)}^{2} + b (- 3) + c$

$- 6 = a \cdot 6^{2} + b (6) - 9 - 9 a + 3 b$

$c = - 9 - 9 a + 3 b$

$2 = a {(- 3)}^{2} + b (- 3) + c$

Step 3.2.2.2

Simplify the right side.

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Step 3.2.2.2.1

Simplify $a \cdot 6^{2} + b (6) - 9 - 9 a + 3 b$ .

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Step 3.2.2.2.1.1

Simplify each term.

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Step 3.2.2.2.1.1.1

Raise $6$ to the power of $2$ .

$- 6 = a \cdot 36 + b (6) - 9 - 9 a + 3 b$

$c = - 9 - 9 a + 3 b$

$2 = a {(- 3)}^{2} + b (- 3) + c$

Step 3.2.2.2.1.1.2

Move $36$ to the left of $a$ .

$- 6 = 36 \cdot a + b (6) - 9 - 9 a + 3 b$

$c = - 9 - 9 a + 3 b$

$2 = a {(- 3)}^{2} + b (- 3) + c$

Step 3.2.2.2.1.1.3

Move $6$ to the left of $b$ .

$- 6 = 36 a + 6 b - 9 - 9 a + 3 b$

$c = - 9 - 9 a + 3 b$

$2 = a {(- 3)}^{2} + b (- 3) + c$

$- 6 = 36 a + 6 b - 9 - 9 a + 3 b$

$c = - 9 - 9 a + 3 b$

$2 = a {(- 3)}^{2} + b (- 3) + c$

Step 3.2.2.2.1.2

Simplify by adding terms.

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Step 3.2.2.2.1.2.1

Subtract $9 a$ from $36 a$ .

$- 6 = 27 a + 6 b - 9 + 3 b$

$c = - 9 - 9 a + 3 b$

$2 = a {(- 3)}^{2} + b (- 3) + c$

Step 3.2.2.2.1.2.2

Add $6 b$ and $3 b$ .

$- 6 = 27 a + 9 b - 9$

$c = - 9 - 9 a + 3 b$

$2 = a {(- 3)}^{2} + b (- 3) + c$

$- 6 = 27 a + 9 b - 9$

$c = - 9 - 9 a + 3 b$

$2 = a {(- 3)}^{2} + b (- 3) + c$

$- 6 = 27 a + 9 b - 9$

$c = - 9 - 9 a + 3 b$

$2 = a {(- 3)}^{2} + b (- 3) + c$

$- 6 = 27 a + 9 b - 9$

$c = - 9 - 9 a + 3 b$

$2 = a {(- 3)}^{2} + b (- 3) + c$

$- 6 = 27 a + 9 b - 9$

$c = - 9 - 9 a + 3 b$

$2 = a {(- 3)}^{2} + b (- 3) + c$

Step 3.2.3

Replace all occurrences of $c$ in $2 = a {(- 3)}^{2} + b (- 3) + c$ with $- 9 - 9 a + 3 b$ .

$2 = a {(- 3)}^{2} + b (- 3) - 9 - 9 a + 3 b$

$- 6 = 27 a + 9 b - 9$

$c = - 9 - 9 a + 3 b$

Step 3.2.4

Simplify $2 = a {(- 3)}^{2} + b (- 3) - 9 - 9 a + 3 b$ .

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Step 3.2.4.1

Simplify the left side.

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Step 3.2.4.1.1

Remove parentheses.

$2 = a {(- 3)}^{2} + b (- 3) - 9 - 9 a + 3 b$

$- 6 = 27 a + 9 b - 9$

$c = - 9 - 9 a + 3 b$

$2 = a {(- 3)}^{2} + b (- 3) - 9 - 9 a + 3 b$

$- 6 = 27 a + 9 b - 9$

$c = - 9 - 9 a + 3 b$

Step 3.2.4.2

Simplify the right side.

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Step 3.2.4.2.1

Simplify $a {(- 3)}^{2} + b (- 3) - 9 - 9 a + 3 b$ .

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Step 3.2.4.2.1.1

Combine the opposite terms in $a {(- 3)}^{2} + b (- 3) - 9 - 9 a + 3 b$ .

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Step 3.2.4.2.1.1.1

Reorder the factors in the terms $b (- 3)$ and $3 b$ .

$2 = a {(- 3)}^{2} - 3 b - 9 - 9 a + 3 b$

$- 6 = 27 a + 9 b - 9$

$c = - 9 - 9 a + 3 b$

Step 3.2.4.2.1.1.2

Add $- 3 b$ and $3 b$ .

$2 = a {(- 3)}^{2} - 9 - 9 a + 0$

$- 6 = 27 a + 9 b - 9$

$c = - 9 - 9 a + 3 b$

Step 3.2.4.2.1.1.3

Add $a {(- 3)}^{2} - 9 - 9 a$ and $0$ .

$2 = a {(- 3)}^{2} - 9 - 9 a$

$- 6 = 27 a + 9 b - 9$

$c = - 9 - 9 a + 3 b$

$2 = a {(- 3)}^{2} - 9 - 9 a$

$- 6 = 27 a + 9 b - 9$

$c = - 9 - 9 a + 3 b$

Step 3.2.4.2.1.2

Simplify each term.

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Step 3.2.4.2.1.2.1

Raise $- 3$ to the power of $2$ .

$2 = a \cdot 9 - 9 - 9 a$

$- 6 = 27 a + 9 b - 9$

$c = - 9 - 9 a + 3 b$

Step 3.2.4.2.1.2.2

Move $9$ to the left of $a$ .

$2 = 9 a - 9 - 9 a$

$- 6 = 27 a + 9 b - 9$

$c = - 9 - 9 a + 3 b$

$2 = 9 a - 9 - 9 a$

$- 6 = 27 a + 9 b - 9$

$c = - 9 - 9 a + 3 b$

Step 3.2.4.2.1.3

Combine the opposite terms in $9 a - 9 - 9 a$ .

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Step 3.2.4.2.1.3.1

Subtract $9 a$ from $9 a$ .

$2 = 0 - 9$

$- 6 = 27 a + 9 b - 9$

$c = - 9 - 9 a + 3 b$

Step 3.2.4.2.1.3.2

Subtract $9$ from $0$ .

$2 = - 9$

$- 6 = 27 a + 9 b - 9$

$c = - 9 - 9 a + 3 b$

$2 = - 9$

$- 6 = 27 a + 9 b - 9$

$c = - 9 - 9 a + 3 b$

$2 = - 9$

$- 6 = 27 a + 9 b - 9$

$c = - 9 - 9 a + 3 b$

$2 = - 9$

$- 6 = 27 a + 9 b - 9$

$c = - 9 - 9 a + 3 b$

$2 = - 9$

$- 6 = 27 a + 9 b - 9$

$c = - 9 - 9 a + 3 b$

$2 = - 9$

$- 6 = 27 a + 9 b - 9$

$c = - 9 - 9 a + 3 b$

Step 3.3

Since $2 = - 9$ is not true, there is no solution.

No solution