Question

Y=x^2-49 factor the expression

Answer 1

Do you remember difference of 2 squares?

Answer 2

\(\bf y=x^2-49 \qquad \qquad 49=7^2\qquad thus\\ \quad \\
y = x^2-7^2\\ \quad \\
\textit{recall that }\qquad a^2-b^2 = (a-b)(a+b)\)