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f(3) = -2 . 3 + 3 = -3
b. f(a) = -2a + 3 = -7
= -2a = -7 - 3
= a = -10 : (-2)
a = 5
semoga membantu :)
f(-2)= -2.-2 + 3
f(-2)= 4+ 3
f(-2)= 7
jadi, bayangan dari -2 = 7
f(x) = -2x+3
f(3)= -2.3 + 3
f(3)= (-6) + 3
f(3)= -3
jadi bayangan dari 3 adalah -3
b. f(x) = -2x+3
f(a)= -2.a + 3
-7 = -2a + 3
-10 = -2a
5 = a