Question

Diketahui fungsi f(x)=3x +4 dan g(x)= x^2 + 6. nilai x yang memenuhi (f°g)(x)= 49 adalah

Answer 1

(f°g)(x)= 49
f( x² + 6) = 49
3( x² + 6) +4 = 49
3x²+18 + 4 = 49
3x² + 22 = 49
3x² = 49-22
3x = 27
x² = 27/3
x² = 9
x = √9
x = 3

Answer 2

=3(X^2 + 6) + 4
=3X^2 + 22
X^2 = 27
X^2 = 9
X = 3