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OpenStudy (anonymous):
Find the derivative of f(x) = -12x2 + 9x at x = 6 Please show me how to do this!
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OpenStudy (anonymous):
f(x)=-24+9(6)
OpenStudy (anonymous):
and then 9(6)=54 and so it should look like f(x)=30
OpenStudy (john_es):
\[f'(x)=-12\cdot2\cdot x^{2-1}+9=-24x+9\]Then evaluate in x=6.
OpenStudy (anonymous):
My answers are -112.5 -135 -90 -108 Thats why I'm confused
OpenStudy (john_es):
You substitue x=6, \[-144+9=-135\]
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