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Posted by **REALLY NEED HELP!!!!** on Wednesday, November 10, 2010 at 1:00am.

and f'( -3) =2 and f( -3)=-1.

Find f'(x) =______

and find f( 1) =_____

- Math: Calculus -
**Reiny**, Wednesday, November 10, 2010 at 8:29amy '' = 4x+3

y' = 2x^2 + 3x + C

when x = -3, y' = 2

2 = 18 - 9 + C

C = -7

so y' = 2x^2 + 3x - 7

then y = (2/3)x^3 + (3/2)x^2 - 7x + K

when x = -3, y = 1

take it from there by solving for K

- Math: Calculus -
**REALLY NEED HELP!!!!**, Wednesday, November 10, 2010 at 3:10pmI don't know why but the answer is wrong.

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