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Jack rewrites the quadratic $9x^2 - 30x - 42$ in the form of $(ax + b)^2 + c,$ where $a$, $b$, and $c$ are all integers. What is $ab$?

 Apr 2, 2021
 #1
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ab = 9*(-30/9) = -30.

 Apr 2, 2021
 #2
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Thank you, but it's incorrect. 

 Apr 6, 2021

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