Expand the expression (9x-8)(-9x-8)

 Exercise

$\left(9x-8\right)\left(-9x-8\right)$

 

Multiply the single term $-9x-8$ by each term of the polynomial $\left(9x-8\right)$

$9x\left(-9x-8\right)-8\left(-9x-8\right)$

 

Multiply the single term $9x$ by each term of the polynomial $\left(-9x-8\right)$

$-81x\cdot x-72x-8\left(-9x-8\right)$

 

When multiplying two powers that have the same base ($x$), you can add the exponents

$-81x^2-72x-8\left(-9x-8\right)$

 

Multiply the single term $-8$ by each term of the polynomial $\left(-9x-8\right)$

$-81x^2-72x+72x+64$

 

Cancel like terms $-72x$ and $72x$

$-81x^2+64$

$-81x^2+64$

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