Question 63103
I am assuming that you need to factor.
7x^2 -175  
7x^2-7(25)Factor out the GCF, 7.
7(x^2-25)  
7((x)^2-(5)^2)Factor the difference of squares {{{highlight(a^2-b^2=(a+b)(a-b))}}}
{{{highlight(7(x+5)(x-5))}}}
Happy Calculating!!!