What happens to the maximum point of f(x) = -2x^2 + 3x + 1, when the function is changed to f(x) = -2x^2 + 9x + 1?

Roger will benefit

Step-by-step explanation:

38 times 4 = 152 without membership for Grace

38 times 6 = 228 without membership for Roger

20 times 4 = 80 + 80 = 160 (Grace cost with membership)

20 times 6 = 120 + 80 = 200 (Roger cost with membership)

152 - 160 = -8 ( Grace pays $8 more with the membership)

228 - 200 = 28 ( Roger saves $28 with a membership)

So Roger gets the better deal.