Precalculus Examples

$f (x) = - 3 x^{3} + 20 x - 36 x + 16$

Step 1

Set $- 3 x^{3} + 20 x - 36 x + 16$ equal to $0$ .

$- 3 x^{3} + 20 x - 36 x + 16 = 0$

Step 2

Solve for $x$ .

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Step 2.1

Subtract $36 x$ from $20 x$ .

$- 3 x^{3} - 16 x + 16 = 0$

Step 2.2

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

$x \approx 0.87457331$

Step 3