Algebra Examples

$y = x^{2} - 2 x + 4$ $y = - x^{2} - 2 x + 4$

Step 1

Eliminate the equal sides of each equation and combine.

$x^{2} - 2 x + 4 = - x^{2} - 2 x + 4$

Step 2

Solve $x^{2} - 2 x + 4 = - x^{2} - 2 x + 4$ for $x$ .

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Step 2.1

Move all terms containing $x$ to the left side of the equation.

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Step 2.1.1

Add $x^{2}$ to both sides of the equation.

$x^{2} - 2 x + 4 + x^{2} = - 2 x + 4$

Step 2.1.2

Add $2 x$ to both sides of the equation.

$x^{2} - 2 x + 4 + x^{2} + 2 x = 4$

Step 2.1.3

Combine the opposite terms in $x^{2} - 2 x + 4 + x^{2} + 2 x$ .

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Step 2.1.3.1

Add $- 2 x$ and $2 x$ .

$x^{2} + 4 + x^{2} + 0 = 4$

Step 2.1.3.2

Add $x^{2} + 4 + x^{2}$ and $0$ .

$x^{2} + 4 + x^{2} = 4$

Step 2.1.4

Add $x^{2}$ and $x^{2}$ .

$2 x^{2} + 4 = 4$

Step 2.2

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

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Step 2.2.1

Subtract $4$ from both sides of the equation.

$2 x^{2} = 4 - 4$

Step 2.2.2

Subtract $4$ from $4$ .

$2 x^{2} = 0$

Step 2.3

Divide each term in $2 x^{2} = 0$ by $2$ and simplify.

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Step 2.3.1

Divide each term in $2 x^{2} = 0$ by $2$ .

$\frac{2 x^{2}}{2} = \frac{0}{2}$

Step 2.3.2

Simplify the left side.

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Step 2.3.2.1

Cancel the common factor of $2$ .

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Step 2.3.2.1.1

Cancel the common factor.

$\frac{2 x^{2}}{2} = \frac{0}{2}$

Step 2.3.2.1.2

Divide $x^{2}$ by $1$ .

$x^{2} = \frac{0}{2}$

Step 2.3.3

Simplify the right side.

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Step 2.3.3.1

Divide $0$ by $2$ .

$x^{2} = 0$

Step 2.4

Take the specified root of both sides of the equation to eliminate the exponent on the left side.

$x = \pm \sqrt{0}$

Step 2.5

Simplify $\pm \sqrt{0}$ .

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Step 2.5.1

Rewrite $0$ as $0^{2}$ .

$x = \pm \sqrt{0^{2}}$

Step 2.5.2

Pull terms out from under the radical, assuming positive real numbers.

$x = \pm 0$

Step 2.5.3

Plus or minus $0$ is $0$ .

$x = 0$

Step 3

Evaluate $y$ when $x = 0$ .

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Step 3.1

Substitute $0$ for $x$ .

$y = - {(0)}^{2} - 2 \cdot 0 + 4$

Step 3.2

Substitute $0$ for $x$ in $y = - {(0)}^{2} - 2 \cdot 0 + 4$ and solve for $y$ .

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Step 3.2.1

Remove parentheses.

$y = - 0^{2} - 2 \cdot 0 + 4$

Step 3.2.2

Remove parentheses.

$y = - {(0)}^{2} - 2 \cdot 0 + 4$

Step 3.2.3

Simplify $- {(0)}^{2} - 2 \cdot 0 + 4$ .

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Step 3.2.3.1

Simplify each term.

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Step 3.2.3.1.1

Raising $0$ to any positive power yields $0$ .

$y = - 0 - 2 \cdot 0 + 4$

Step 3.2.3.1.2

Multiply $- 1$ by $0$ .

$y = 0 - 2 \cdot 0 + 4$

Step 3.2.3.1.3

Multiply $- 2$ by $0$ .

$y = 0 + 0 + 4$

Step 3.2.3.2

Simplify by adding numbers.

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Step 3.2.3.2.1

Add $0$ and $0$ .

$y = 0 + 4$

Step 3.2.3.2.2

Add $0$ and $4$ .

$y = 4$

Step 4

The solution to the system is the complete set of ordered pairs that are valid solutions.

$(0, 4)$

Step 5

The result can be shown in multiple forms.

Point Form:

$(0, 4)$

Equation Form:

$x = 0, y = 4$

Step 6