Evaluate: 7x^2-6x-8

Evaluate: $7x^{2}-6x-8$

Use the distributive property to multiply $2$ by $3x^{2}+x-6$.

$$x^{2}-8x+4+6x^{2}+2x-12$$

Combine $x^{2}$ and $6x^{2}$ to get $7x^{2}$.

$$7x^{2}-8x+4+2x-12$$

Combine $-8x$ and $2x$ to get $-6x$.

$$7x^{2}-6x+4-12$$

Subtract $12$ from $4$ to get $-8$.

$$7x^{2}-6x-8$$