Question

Jika f (2×-3)=4×-7 tentukan nilai f (7)-f(3)=…

Answer 1

F(2x-3) = 4x-7

2x-3 = 7
2x = 10
x = 5
pilih x = 5, maka
f(2(5)-3) = 4(5) -7
f(10-3) = 20-7
f(7) = 13

2x-3 = 3
2x = 6
x =3
pilih x=3 maka
f(2(3)-3) = 4(3) - 7
f(6-3) = 12-7
f(3) = 5

f(7) - f(3) = 13-5 = 8

Answer 2

F (7) = ( 2x - 3 ) = 4x -7
= 2x-4x = -4
= -2x = -4
= x = 2
f (7)= 2.7 = 14
f (3)= 2. 3 = 6

f(7) - f(3) = 14-6 = 8