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OpenStudy (anonymous):
Given the following perfect square trinomial, fill in the missing term. 4x^2 + ___x + 49
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OpenStudy (experimentx):
28
Directrix (directrix):
2*2*7 = 28 4x^2 + 24 x + 49
OpenStudy (anonymous):
\[a^2x + 2ab x + b^2 \] here a =2, b = 7 so 2ab = 28
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