Question

When factored completely, z2 - 9 equals?

Answer 1

(z+3)(z-3)

Explanation:

a^2 - b^2 = (a+b)(a-b) where a = z and b= 3

Answer 2

Let's see

`\\ \bf\bull\rightarrowtail z^2-9`

`\\ \bf\bull\rightarrowtail z^2-3^2`

• (a+b)(a-b)=a^2-b^2

`\\ \bf\bull\rightarrowtail (z+3)(z-3)`