Simplify 3x^2-(9x-8x^2)+4x-4

$3 x^{2} - (9 x - 8 x^{2}) + 4 x - 4$

Simplify each term.

Apply the distributive property.

$3 x^{2} - (9 x) - (- 8 x^{2}) + 4 x - 4$

Multiply $9$ by $- 1$ .

$3 x^{2} - 9 x - (- 8 x^{2}) + 4 x - 4$

Multiply $- 8$ by $- 1$ .

$3 x^{2} - 9 x + 8 x^{2} + 4 x - 4$

$3 x^{2} - 9 x + 8 x^{2} + 4 x - 4$

Simplify by adding terms.

Add $3 x^{2}$ and $8 x^{2}$ .

$11 x^{2} - 9 x + 4 x - 4$

Add $- 9 x$ and $4 x$ .

$11 x^{2} - 5 x - 4$

$11 x^{2} - 5 x - 4$

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