Tolong kerjakan yang. secepatnya sebenarnya :v no .14

f'(x) = 2ax + b
f'(-2) = - 3 => - 4a+b = - 3
f'(2) = 13 => 4a+b = 13
___________________(+
2b = 10 => b=5

-4a+5 = - 3
-4a = - 8 => a = 2
Mk a+b = 2+5 = 7 (C)

untuk x = 2 maka
13 = a.2^2 + b.2 - 3
16 = 4a + 2b
8 = 2a + b ..... pers.1
gradien -3
m=y'
= 2ax + b
-3 = 2a.(-2) + b
-3 = -4a + b ... pers.2
eliminasi
2a + b = 8
-4a + b = -3
-------------- -
6a = 11
a= 11/6
maka 2(11/6) + b = 8
b = 8 - 22/6
= 26/6
maka a + b = 11/6 + 26/6 = 37/6