Question

PLEASE HELP ASAP!!! CORRECT ANSWER ONLY PLEASE!!!

Answer 1

$12x^2-75=3(4x^2-25)=3(2^2x^2-5^2)=3((2x)^2-5^2)=3(2x+5)(2x-5)\\\\\text{Used:}\ a^2-b^2=(a+b)(a-b)\\\\Answer:\ 5$