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OpenStudy (anonymous):
is this correct ? Factor: x2 - 13x + 36 (x - 4)(x - 9)
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OpenStudy (turingtest):
yep :)
Directrix (directrix):
Yes. (x - 4)(x - 9) = x^2 - 4x - 9x + 36 = x^2 - 13x + 36 which is the original expression.
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