Cari nilai nya,menggunakan cara jg y​

Jawaban:

f(x)=2x + 4

f(-1) = 2×(-1) + 4

f(-1) = (-2) + 4

f(-1) = 2

f(3) = 2×(3) + 4

f(3) = 6 + 4

f(3) = 10

maka f(-1) + f(3)

= 2 + 10

= 12

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