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FOIL or CLAM..............

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A perfect square trinomial is shown by either of the two:
(a+b)²= a²+2ab+b²
(a-b)² = a²-2ab+b²

So we just get the square root of the first and last term then we add them or subtract them according to the sign of the second term.
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a. the sum of the square of the first second and third terms.
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