Which equation is true?
9x2 – 25 = (3x – 5)(3x – 5)
9x2 – 25 = (3x – 5)(3x + 5)
9x2 – 25 = –(3x + 5)(3x + 5)
9x2 – 25 = –(3x + 5)(3x – 5)

ANSWER



EXPLANATION

We want to factor


Observe that, both
and are perfect squares.

Thus,

and



We need to rewrite the expression as a difference of two squares to obtain,



We apply the difference of two squares formula which is given by,



By comparing this to our expression we let


Then our expression can now be factored as,



Therefore the correct option is B.