write the expression of (g+f) (x) and (g-f) for f(x) = 3x^2 and g(x) = x-5 and evaluate (g*f)(2)

Question

write the expression of (g+f) (x) and (g-f) for f(x) = 3x^2 and g(x) = x-5 and evaluate (g*f)(2). 

Answer 1

(g + f)(x) = g(x) + f(x)

 

(g*f)(2) = g(2) * f(2)

 

(g - f)(x) = g(x) - f(x)