Diketahui f(x)=2x+7 dan g(x)=x²-4x+6. bila (f+g)(x)=28 maka nilai x adalah
Jawaban Terkonfirmasi
F(x) = 2x + 7
G(x) = x^2 – 4x + 6
(f + g) (x) = 28
F(x) + g(x) = 28
2x + 7 + x^2 – 4x + 6 = 28
x^2 – 2x + 13 = 28
x^2 – 2x + 13 – 28 = 0
x^2 – 2x – 15 = 0
(x – 5)(x + 3) = 0
x = 5, x = – 3
Maka x = 5 atau x = – 3
Semoga membantu 😀
(f+g)(x)= f(x) + g(x)
28 = 2x+7 + x^2 -4x+6
28 = x^2 -2x+ 13
0= x^2 -2x+13-28
0 = x^2 -2x-15
(x-5)(x+3) =0
x1 = 5, x2= -3