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OpenStudy (anonymous):
What is the value of n so that the expression x² + 12x + n is a perfect square trinomial? 6 36 72 144
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Directrix (directrix):
Take half the coefficient of the linear x term and square it.
OpenStudy (anonymous):
ok but is it a, b, c,or d
Directrix (directrix):
12/2 = 6 6*6 = 36 x² + 12x + 36 = (x + 6)(x + 6) = (x+6)² which expands back to the perfect square trinomial.
Directrix (directrix):
The letter assigned to 36. n = 36
OpenStudy (anonymous):
thank you
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Directrix (directrix):
Glad to help, @cupcakekiller1234
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