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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"? A. 2 B.-21 C.-1 D.1
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OpenStudy (the_fizicx99):
FOIL it out, "b" is: \(\ \sf ax^2 + \color{red}{b}x + c \)
OpenStudy (anonymous):
How???
OpenStudy (cp9454):
multiply and you will get b=1
OpenStudy (anonymous):
Thanks!!!
OpenStudy (cp9454):
you are welcome
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