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OpenStudy (anonymous):
If f(x)=13-8x+ sqrt(2)*x^2 and f'(r) = 4, find r. I'm not sure how r relates to f(x), as this is all the question says. Can anyone help me get started? Thanks.
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OpenStudy (anonymous):
\[f(x)=13-8x+ \sqrt{2}x ^{2}\]
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