Diketehui fungsi f(x) = x + 3 dan g(x) = x2 – 9 tentukan fungsi dari (f x g ) ​

Jawaban:

dik : f(x) = x+3

g(x) = x^2-9

dit : a. (f+g)(x)

b. (f-g)(x)

c. (f×g)(x)

jb:

a. (f+g)(x) = f(x) + g(x)

= (x+3)+(x^2-9)

= x^2 + x-6

b. (f-g)(x) = f(x) – g(x)

= (x+3)-(x^2-9)

= -x^2 + x + 12

=x^2 – x – 12

c. (f×g)(x) = f(x) × g(x)

= (x+3)(x^2-9)

= x^3 + 3x^2 – 9x – 27