Question

Diketahui f(2x-3)=4x-7 , maka nilai dari f(17)-f(7) adlah..
bantu jwb y? pke cra .. thx

Answer 1

f(2x-3) = 4x - 7
misal : 2x - 3 = a
               2x = a + 3
                 x = 1/2( a + 3)
f(2x-3) = 4x - 7
    f(x) = 4.(1/2( a + 3)) - 7
    f(x) = 2x + 6 - 7
    f(x) = 2x - 1
f(17)-f(7)  = {2.(17) - 1} - {2.(7) - 1}
              = (34 - 1) - (14 - 1)
              = 33 - 13
              = 20

Answer 2

F(2x-3) = 4x-7
misal: 2x-3 = a
          2x = a+3
           x = (a+3)/2
f(a) = 4.(a+3)/2 - 7
     = 2(a+3) - 7
     = 2a + 6 - 7
f(a) = 2a - 1
f(x) = 2x - 1

f(17) - f(7) = (2.17 - 1) - (2.7 - 1)
               = (34 - 1) - (14 - 1)
               = 33 - 13
               = 20

semoga membantu ya :)