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Determine a value of the constant b so that the graph of y=x^2+bx+17 has a horizontal tangent at (2, 21+2b)

ans: y'(2)=0

y'=2x+b

0=2(2)+b

b=-4

what do u need the y-coordinate (21+2b)for?

My teacher also requires me to draw a diagram...can anybody show me a diagram of this problem?

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# Homework Help: Determine when y = x^2 + bx + 17 has horizontal tangent

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