f(x) = 2x^2 + 9x - 5 g (x) = x+5 tentukan a. (f-g) (2) b. (f-g) (6) c. (fxg) (x)

a. (f-g)(2)=(2x^2+9x-5)-(x+5)
_________=2x^2+8x-10
_________=2(2)^2+8(2)-10
_________=8+16-10
_________=14 ✔

b. (f-g)(6)=2(6)^2+8(6)-10
_________=72+48-10
_________=110 ✔

c. (fxg)(x)=(2x^2+9x-5)(x+5)
_________=(2x^2+9x-5)(x)+(2x^2+9x-5)(5)
_________=(2x^3+9x^2-5x)+(10x^2+45x-25)
________=2x^3+19x^2+40x-25 ✔