Question

Diketahui rumus fungsi f(x) = -2x+4, f(-4)= a dan f(b)=10. Nilai a-b adalah

Answer 1

F(x) = -2x + 4
f(-4) = a
f(-4) = -2(-4) + 4
   a  = 8 + 4
   a = 12

f(b) = 10
-2b + 4 = 10
-2b = 10 - 4
-2b = 6
-2b = 6
b = 6/-2
b = -3

Nilai a - b
12 - (-3)
12 + 3
15