Question

What is the completely factored form of 8 x square minus 50

Answer 1

Lets factor first to see if we can make the problem simple
2(4x^2-25)
now we see that in parenthesis we have 2 square numbers
4x^2=(2x)^2
25=(5)^2
our expression is now 
2(2x+5)(2x-5)