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OpenStudy (anonymous):
When the quadratic equation y = (x − 3)(2x + 7) is written in standard form, what is the value of the coefficient "b"?
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OpenStudy (angela210793):
I already answered it..don't post the same question many times
OpenStudy (unklerhaukus):
\[y=(x-3)(2x+7)\]\[=(x\times2x)+(7x-3\times2x)-(3\times7)\]\[=(1\times2)x^2+(7-3\times2)x+(-3\times7)\] \[y=ax^2+bx+c\]
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