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OpenStudy (anonymous):
Square the binomial. -(3x-9)^2
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OpenStudy (anonymous):
Just expand (3x-9)(3x-9), then multiply what you get by a negative sign
OpenStudy (anonymous):
So, -9x^2+81 ?
OpenStudy (anonymous):
not quite
OpenStudy (anonymous):
It's -81, isn't it?
OpenStudy (anonymous):
I meant -(9x^2-54x+81)
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OpenStudy (anonymous):
now just distribute the negative sign
OpenStudy (anonymous):
Oh! I got it. So it's -9x^2+54x-81
OpenStudy (anonymous):
yeah
OpenStudy (anonymous):
Thanks! I forgot the middle term. lol
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