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f (2) ⇒ (2 + a ) + 3 = 7
a + 5 = 7
a = 7 - 5
a = 2
a.) bentuk fungsi
f(x) = ( x + a) + 3
= ( x + 2) + 3
= x + 5
b.) nilai f(-2) + f(-1)
jawaban = f(-2) + f(-1)
= ( x + 5) + ( x + 5)
= ( -2+5) + ( -1+5)
= 3 + 4
= 7