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Perfect Square Trinomials

Like the difference of squares formula, perfect square trinomial formulas are very common on the test.


For example, .
Note: In a perfect square trinomial, the middle term is twice the product of the square roots of the outer terms.



If , then

A.  –4
B.  4
C.  8
D.  16
E.  64


     by the formula


  by cubing both sides of the equation


    by the rule


The answer is (E).

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