Difference+of+Squares

__‍‍ When to use it: __
 * when both terms are perfect squares
 * must have a subtraction sign between the two terms
 * must be a binomial

__Explanation:__ 1.) Make sure it is a binomial, with two perfect squares, and a subtraction sign between the terms. 2.) Then find the square root of each of the terms. 3.) Set up two sets of parenthesis, and put the square root of the first term on the left side of the parenthesis. Then put the square root of the other term on the right side of the parenthesis. 4.) Put an addition sign in one set of parenthesis, and put a subtraction sign in the other set. __Examples:__
 * x 2 -25
 * square root of x 2 is x
 * square root of 25 is 5
 * (x 5) (x 5)
 * (x-5) (x+5)

1.) 4x 2 - 25 (2x+5) (2x-5) ‍

2.) 16x 2 -36 (4x-6) (4x+6)

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