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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.

 

Example

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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