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f(3)=-2.3+3=-6+3= -3
b.f(-7)=-2.-7+3=14+3 = 17
f(-2) = -2(-2) +3
= 4 +3
= 7
f(x) = -2x +3
f(3) = -2(3) +3
= -6 +3
= -3
b. f(x) = -2x +3
f(a) = -2(a) +3 = -7
= -2a +3 = -7
= -2a = -7 -3
= -2a = -10
= a = -10 / -2
= a = 5
Jadi, nilai a = 5.