Question 341884
If y=2x^4-36x^2, what are the points at which the tangent to the curve is parallel to the x-axis?
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y = 2x^4-36x^2
y' = {{{8x^3 - 72x = 0}}}
x = 0
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{{{8x^2 - 72 = 0}}}
x = ± 3