Finite Math Examples

$4 x - 7 x^{2} + 5 x^{3} = 35$ , $2 x - x^{2} + 3 x^{3} = 5$ , $3 x^{2} - x^{3} = - 11$

Step 1

Graph each side of the equation. The solution is the x-value of the point of intersection.

$x \approx 2.33821242$

$2 x - x^{2} + 3 x^{3} = 5$

$3 x^{2} - x^{3} = - 11$

Step 2

Replace all occurrences of $x$ with $2.33821242$ in each equation.

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Step 2.1

Replace all occurrences of $x$ in $2 x - x^{2} + 3 x^{3} = 5$ with $2.33821242$ .

$2 (2.33821242) - {(2.33821242)}^{2} + 3 {(2.33821242)}^{3} = 5$

$x \approx 2.33821242$

$3 x^{2} - x^{3} = - 11$

Step 2.2

Simplify the left side.

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Step 2.2.1

Simplify $2 (2.33821242) - {(2.33821242)}^{2} + 3 {(2.33821242)}^{3}$ .

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Step 2.2.1.1

Simplify each term.

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Step 2.2.1.1.1

Multiply $2$ by $2.33821242$ .

$4.67642485 - {(2.33821242)}^{2} + 3 {(2.33821242)}^{3} = 5$

$x \approx 2.33821242$

$3 x^{2} - x^{3} = - 11$

Step 2.2.1.1.2

Raise $2.33821242$ to the power of $2$ .

$4.67642485 - 1 \cdot 5.46723736 + 3 {(2.33821242)}^{3} = 5$

$x \approx 2.33821242$

$3 x^{2} - x^{3} = - 11$

Step 2.2.1.1.3

Multiply $- 1$ by $5.46723736$ .

$4.67642485 - 5.46723736 + 3 {(2.33821242)}^{3} = 5$

$x \approx 2.33821242$

$3 x^{2} - x^{3} = - 11$

Step 2.2.1.1.4

Raise $2.33821242$ to the power of $3$ .

$4.67642485 - 5.46723736 + 3 \cdot 12.78356237 = 5$

$x \approx 2.33821242$

$3 x^{2} - x^{3} = - 11$

Step 2.2.1.1.5

Multiply $3$ by $12.78356237$ .

$4.67642485 - 5.46723736 + 38.35068711 = 5$

$x \approx 2.33821242$

$3 x^{2} - x^{3} = - 11$

$4.67642485 - 5.46723736 + 38.35068711 = 5$

$x \approx 2.33821242$

$3 x^{2} - x^{3} = - 11$

Step 2.2.1.2

Simplify by adding and subtracting.

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Step 2.2.1.2.1

Subtract $5.46723736$ from $4.67642485$ .

$- 0.7908125 + 38.35068711 = 5$

$x \approx 2.33821242$

$3 x^{2} - x^{3} = - 11$

Step 2.2.1.2.2

Add $- 0.7908125$ and $38.35068711$ .

$37.5598746 = 5$

$x \approx 2.33821242$

$3 x^{2} - x^{3} = - 11$

$37.5598746 = 5$

$x \approx 2.33821242$

$3 x^{2} - x^{3} = - 11$

$37.5598746 = 5$

$x \approx 2.33821242$

$3 x^{2} - x^{3} = - 11$

$37.5598746 = 5$

$x \approx 2.33821242$

$3 x^{2} - x^{3} = - 11$

Step 2.3

Replace all occurrences of $x$ in $3 x^{2} - x^{3} = - 11$ with $2.33821242$ .

$3 {(2.33821242)}^{2} - {(2.33821242)}^{3} = - 11$

$37.5598746 = 5$

$x \approx 2.33821242$

Step 2.4

Simplify the left side.

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Step 2.4.1

Simplify $3 {(2.33821242)}^{2} - {(2.33821242)}^{3}$ .

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Step 2.4.1.1

Simplify each term.

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Step 2.4.1.1.1

Raise $2.33821242$ to the power of $2$ .

$3 \cdot 5.46723736 - {(2.33821242)}^{3} = - 11$

$37.5598746 = 5$

$x \approx 2.33821242$

Step 2.4.1.1.2

Multiply $3$ by $5.46723736$ .

$16.4017121 - {(2.33821242)}^{3} = - 11$

$37.5598746 = 5$

$x \approx 2.33821242$

Step 2.4.1.1.3

Raise $2.33821242$ to the power of $3$ .

$16.4017121 - 1 \cdot 12.78356237 = - 11$

$37.5598746 = 5$

$x \approx 2.33821242$

Step 2.4.1.1.4

Multiply $- 1$ by $12.78356237$ .

$16.4017121 - 12.78356237 = - 11$

$37.5598746 = 5$

$x \approx 2.33821242$

$16.4017121 - 12.78356237 = - 11$

$37.5598746 = 5$

$x \approx 2.33821242$

Step 2.4.1.2

Subtract $12.78356237$ from $16.4017121$ .

$3.61814973 = - 11$

$37.5598746 = 5$

$x \approx 2.33821242$

$3.61814973 = - 11$

$37.5598746 = 5$

$x \approx 2.33821242$

$3.61814973 = - 11$

$37.5598746 = 5$

$x \approx 2.33821242$

$3.61814973 = - 11$

$37.5598746 = 5$

$x \approx 2.33821242$

Step 3

Since $3.61814973 = - 11$ is not true, there is no solution.

No solution

Step 4