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Perfect Square Trinomials

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


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

  1. –4
  2. 4
  3. 8
  4. 16
  5. 64

by the formula
by cubing both sides of the equation
by the rule
The answer is (E).

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