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= 2.(6)^2 - 7
= 2.36 - 7
= 72 - 7
= 65
f(-4) = 2.x^2 - 7
= 2.(-4)^2 - 7
= 2.16 - 7
= 32 - 7
= 25
f(x) = 11
=2.x^2 - 7 = 11
= 2.x^2 = 11-7
= 2.x^2 = 4
= x^2 = 4/2
= x^2 = 2
= x = akar dari 2
f (-4) = 2 . (-4) kuadrat -7 = 2.16 -7= 32-7 = 25
B) f(x) = 11
2x²-7 =11
2x²= 18
x²= 18/2 =9
x² = 9
x = akar dari 9 = 3