Whatever is inside of the ( ), simply plug that digit into the x-values for f(x) So: f(x) = 7x - x^2, and f(7+h) - f(7) = [7(7+h) - (7+h)^2] - [7(7) - (7)^2] = [49+7h - 49+14h+h^2] - [49-49] = 49-49 + 7h+14h + h^2 = h^2 + 21h = h (h+21), h (h+21) = 0 h=0... But it stated h cannot = 0 So h+21 = 0, h = -21
Alfonso will need to work 8 hours. What i did was multiply 8 by 6 which is 48 then subtracted 48 by 144 and got 96 then you divide that by 12 which is 8, and that is how many hours he will have to work.
