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= 7
f (3) = -2 (3) + 3
= -6 + 3 = -3
F (a) = -2a + 3 = -7
-2a = -9
a = 9/2
f(-2) = -2(-2) +3
= 4 +3
= 7
f(3) = -2(3) +3
= -6 +3
= -3
b. f(a) = -2(a) +3 = -7
= -2a +3 = -7
= -2a = -7 -3
= -2a = -10
= a = -10/-2
= a = 5
Jadi, nilai a adalah 5.