Question

Which of the following expressions has the greatest value when x=5? show how you arrived at your choice.

2x^2+7

x^3-5/3

10x -2/ x-3

Answer 1

2x^2+7

Explanation:

Let x=5

2x^2+7

2 ( 5)^2 +7 = 2*25 +7 = 50+7 = 57

(x^3-5)/3

(5^3 -5)/3 = (125-5)/3 = 120/3 = 40

(10x -2)/ (x-3)

(10*5-2)/(5-3) = (50-2)/(2) = 48/2 = 24