nilai f (22) adalah........

Misalkan :
4x + 2 = y
4x = y - 2
x = (y - 2)/4

Maka,
f(x) = [(x - 2)/4 - 3][(x - 2)/4 + 12]

Maka :
f(22) = [(22 - 2)/4 - 3][(22 - 2)/4 + 12]
f(22) = [5 - 3][5 + 12]
f(22) = 2 x 17
f(22) = 34

f(4x+2) = (x-3)(x+12)
f(22) --> f(4.x+2)=(×-3)(×+12)
x-->(22-2):4
x-->5

f(22) = f(4.5-2) = (5-3)(5+12)
= f(4.5-2) = 2.17
= 34


Jadi,nilai dari f(22) adalah 34 (B)

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