Evaluate (9x^2-8)-(-4x^2-5x)

$(9 x^{2} - 8) - (- 4 x^{2} - 5 x)$

Step 1

Simplify each term.

Apply the distributive property.

$9 x^{2} - 8 - (- 4 x^{2}) - (- 5 x)$

Multiply $- 4$ by $- 1$ .

$9 x^{2} - 8 + 4 x^{2} - (- 5 x)$

Multiply $- 5$ by $- 1$ .

$9 x^{2} - 8 + 4 x^{2} + 5 x$

$9 x^{2} - 8 + 4 x^{2} + 5 x$

Step 2

Add $9 x^{2}$ and $4 x^{2}$ .

$13 x^{2} - 8 + 5 x$

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