Question

What is the answer to x2-100??

Answer 1

Step 1. Rewrite it in the form $a^{2} - b^{2} ,$ where $a=x$ and $b=10$

$x^{2} - 10^{2}$

Step 2. Use Difference of Squares $a^{2} - b^{2} =(a+b)(a-b)$

$(x+10)(x-10)$