Diketahui fungsif(x)=x²+6x-18tentukan nilaif(4)danf(-5)

[tex]f(4) = 4{}^{2} + 6 \times 4 - 18 \\ =16 + 24 - 18 \\ = 22 \\ \\ f(5) = {5}^{2} + 6 \times 5 - 18 \\ = 25 + 30 - 18 \\ = 27[/tex]

Kelas 8 Matematika
Bab Fungsi

1] f(x) = x² + 6x - 18
f(4) = 4² + 6 . 4 - 18
f(4) = 16 + 24 - 18
f(4) = 22

2] f(-5) = (-5)² + 6 .(-5) - 18
f(-5) = 25 - 30 - 18
f(-5) = -23