48x - 6
11x2 + 6x - 7
32x + 7
24x2 - 6x + 7
Correct answer is A
y = 8x3 - 3x2 + 7x - 1
d2ydx2=ddx(dydx)
= ddx(24x2−6x+7)
d2ydx2=48x−6
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