please tolong kerjain a ,b ,c dan d

f(x) = 2x² + 4x - 15
g(x) = -x + 2

(f+g)(x)
= f(x) + g(x)
= 2x² + 4x - 15 + (-x + 2)
= 2x² + 4x - 15 - x + 2
= 2x² + 3x - 13

(f - g)(x)
= f(x) - g(x)
= 2x² + 4x - 15 - (-x + 2)
= 2x² + 4x - 15 + x - 2
= 2x² + 5x - 17

(f . g)(x)
= f(x) . g(x)
= (2x² + 4x - 15) (-x + 2)
= -2x³ - 4x² + 15x + 4x² + 8x - 30
= -2x³ + 23x - 30

(f/g)(x)
= (2x² + 4x - 15) / (-x + 2)