Year 11 calculuss methods

[From: ] [author: ] [Date: 11-08-07] [Hit: ]

This is not one of your choices, but it is correct.......

if the curve with the equation y=2x^2+ax+g has a stationary point at x=-3 then a equals??

A.-6
B. 6
C. 3
D. -12
E. 10

thank you

y' = 4x + a = 0

–12 + a = 0

a = 12. This is not one of your choices, but it is correct.

f ` (x) = 4x + a

f ` (-3) = -12 + a = 0

a = 12

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