tentukan fungsi komposisi di bawah ini! jika diketahui : f(x) = 5x - 18 g(x) = x²+3, maka : a) (f-g)(x) =... b) (f×b)(x) =.. c) (f+g)(1) =...

a. (f-g)x = (5x-18)-(x^2+3)
= -x^2+5x -21
b. (f.g) x = (5x-18)(x^2+3)
= 5x^3-18x^2+15x-54
c. (f+g) x = (5x-18)+(x^2+3)
= x^2+5x-15

a) (f-g)(x) = f(x)-g(x)
= 5x-18 - (x²+3)
= 5x-18-x²-3 = -x²+5x-21
b) (f×b)(x) ???
gak ada b tu... hehe
c) (f+g)(x) = 5x-18+x²+3
(f+g)(1) = 5(1)-18+(1)²+3
= 5-18+1+3 = -9