Diketahui fungsi f(x) = 4x+5. Tentukan nilai fungsi untuk x=5 dan x=-3!
Jawaban:
f(x) = 4x + 5
• nilai f(5)
f(x) = 4x + 5
f(5) = 4(5) + 5
f(5) = 20 + 5
f(5) = 25
• nilai f(-3)
f(x) = 4x + 5
f(-3) = 4(-3) + 5
f(-3) = -12 + 5
f(-3) = -7
Rumus fungsi : f(x) = 4x + 5
Nilai f(5)
f(5) = 4(5) + 5
f(5) = 20 + 5
f(5) = 25
Nilai f(-3)
f(-3) = 4(-3) + 5
f(-3) = -12 + 5
f(-3) = -7