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Mathematics 15 Online
OpenStudy (anonymous):

Which polynomial is a perfect square trinomial? A. 9x2 − 12x + 4 B. 36b2 − 24b + 16 C. 16x2 − 24x − 9 D. 4a2 − 10a − 25

Directrix (directrix):

A. 9x^2 − 12x + 4 First term is a square, last term is a square, middle term is positive or negative the product of square root of first term and that of the last. -2(3x)(2) = -12x

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