Question

X+4 is prime. X2-9can be factored using the __formula

Answer 1

$\purple \bold{a^2 - b^2}$

Step-by-step explanation:

X+4 is prime. X2-9can be factored using the $\purple \bold{a^2 - b^2}$ formula

$x^2 - 9\\=x^2 - 3^2 \\= (x+3)(x-3)$