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OpenStudy (anonymous):
What is the maximum value of the function y=-x^2+8x+3?
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OpenStudy (wolf1728):
-x² + 8x +3 = 0 we differentiate the equation -2x +8 = 0 when x = 4 the equation is at a maximum.
OpenStudy (anonymous):
@wolf1728's method works, but if you're not in calc yet you'll have to write the function in vertex form. Try completing the square.
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