The formula is: A2 - B2 = (A + B) (A - B)
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this is what type of question? value of x? difference of 2 squares? factoring?
There is a formula for the "difference of squares." In this case, the answer is (5x - 6)(5x + 6)
First you should take out the common factor. After you do that, in this case you have a difference of square, so you can use the formula for a difference of squares.
Use squares and try it out for yourself. Get a number of squares and make a rectangle 3 squares long by 4 squares wide. Count the squares. You should have 12 squares (or 3*4). That's the best way I know to prove the formula.
There is a formula for "the difference of squares." (x + 7)(x - 7) = 0 x = 7, -7