Find the following values for the given functions fx x2 gx

Find the following values for the given functions. f(x) = - x^2, g(x) = 3x - 9 (a) (f + g)(4) (b) (f - g)(4) (c) (fg)(4) (d) (f/g)(4)

Solution

a) (f+g)(4)

= f(4)+g(4)

= -4^2+3*4-9

= -16+12-9

= -13

b) (f-g)(4)

= f(4)-g(4)

= -4^2-(3*4-9)

= -16-12+9

= -19

c) (fg)(4)

= f(4)g(4)

= -16*3

= -48

d) (f/g)(4)

= f(4)/g(4)

= -16/3