Digital SAT Math : Factoring with Difference of Two Squares
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a2 - b2 = (a + b)(a - b)
The above is an algebraic identity that can be used to factor an expression, where we have the difference of two squares. In the identity above a2 - b2 is the difference of two squares a2 and b2, and (a + b)(a - b) is the factored form of a2 - b2.
Problem 1 :
Factor :
x2 - 25
Problem 2 :
Factor :
36x2 - 1
Problem 3 :
Factor :
16x5 - 81x
Problem 4 :
Simplify :
Answers
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