Question

For the function, f(x) = 8x + 5x, find the following. (a) f(5) D NUD K (b) f(-2) orea (c) f(4.2) muca (d) f(-4.2)

Answer 1

(a) 65

(b) -26

(c) 54.6

(d) -54.6

Explanation:

(a)
`f(5)=8(5)+5(5)=40+25=65`

(b)
`f(-2)=8(-2)+5(-2)=-16-10=-26`

(c)
`f(4.2)=8(4.2)+5(4.2)=33.6+21=54.6`

(d)
`f(-4.2)=8(-4.2)+5(-4.2)=-33.6-21=-54.6`