Question

Rumus fungsi f(x) = 2 ax+b. jika nilai f(2)= 20 dan f(4) = 10, maka rumus fungsinya adalah. caranya yang lengkap ya.. biar paham

Answer 1

Nilai A : f(2) = a.2 + b
= 2a + b = 20
= 4a + b = 10
-------------------- -
= -2a + 0 = 10
= -2a = 10
= a = 10 : -2 = -5

nilai B :
2a + b = 20
2.-5 + b = 20
-10 + b = 20
b = 20:-10 = -2