Finite Math Examples

$x^{4} - 9 x^{- 2} + 20 = 0$

Step 1

Simplify each term.

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Step 1.1

Rewrite the expression using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$x^{4} - 9 \frac{1}{x^{2}} + 20 = 0$

Step 1.2

Combine $- 9$ and $\frac{1}{x^{2}}$ .

$x^{4} + \frac{- 9}{x^{2}} + 20 = 0$

Step 1.3

Move the negative in front of the fraction.

$x^{4} - \frac{9}{x^{2}} + 20 = 0$

Step 2

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

$x \approx - 0.66751538, 0.66751538$

Step 3