Diketahui f(x) = 3^2x + 3^3-2x. apabila f(a)=f(b) =20 maka a+b?
AidaFajri
Kalo emang benerbsoalnya gitu a sama b nya -1 kalo ditambahin jadi -2 f(x) = 3^2x + 3^3 - 2x = 9x + 27 - 2x = 7x + 27 20 = 7x + 27 7x = 20 - 27 7x = -7 x = -7/7 x = -1 x itu a/b yang kita cari. a + b = -1 + (-1) = -2
f(x) = 3^2x + 3^3 - 2x
= 9x + 27 - 2x
= 7x + 27
20 = 7x + 27
7x = 20 - 27
7x = -7
x = -7/7
x = -1
x itu a/b yang kita cari. a + b = -1 + (-1)
= -2