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OpenStudy (anonymous):
The curve with equation y = 2x2 + bx + 8 has a turning point at x = 3. Find the value of b, show working please.
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OpenStudy (cwrw238):
y' = 4x + b = 0 at turning points
OpenStudy (cwrw238):
when x = 3 y' = 4(3) + b = 0 12 + b = 0 b = -12
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