Question

Please solve this problem using the foil methodmula1" title=" {x}^{2} - 9" alt=" {x}^{2} - 9" align="absmiddle" class="latex-formula">
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Answer 1

Answer:

This is already in its simplest form, but if you set the equation equal to zero, it's (x-3)(x+3).

Step-by-step explanation:

x^2-9=0

a= 1

b=0

c=-9

Factors of c (-9) that add up to make b (0): -3, 3

(x-3)(x+3)

Answer 2

we know:   $a^2-b^2=(a+b)(a-b)$

So:    $x^{2} -9=x^{2} -3^2=(x+3)(x-3)$

Ok done. Thank to me :>