sebuah fungsi rumus f(x)=2ax+5,jika f(2)=-7 nilai f(1)

Kelas 8 Matematika
Bab Fungsi

f(x) = 2ax + 5 

f(2) = -7
2 a . 2 + 5 = -7
4a = -7 - 5
a = -12/4
a = -3

f(x) = 2 . (-3) . x + 5
f(x) = -6x + 5

f(1) = -6 . 1 + 5
f(1) = -1