Difference+of+Squares

Difference of Squares -When there are only 2 terms in a quadratic, and both are perfect squares separated by a subtraction sign, this is a difference of squares.-To factor a difference of squares, a^2-b^2= (a+b)(a-b) because when you FOIL, the middle numbers cancel out.So to factor 81x^2-49, Example 1 144x^2-25
 * 1) Find the square root of 81x^2 and 49.
 * 2) Then follow the step above.
 * 3) 81x^2-49=(9x-7)(9x+7)
 * 1) sqr144x^2= 12x; sqr25= 5
 * 2) (12x-5)(12x+5)
 * 3) 144x^2-25=(12x-5)(12x+5)

Example 2 121x^2-16
 * 1) sqr121x^2=11x; sqr16=4
 * 2) (11x-4)(11x+4)
 * 3) 121x^2-16=(11x-4)(11x+4)

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