f(x) = 9x^2 - 5x + 3 is given. The notation means that wherever you see and x on the right, you replace it with the x in the brackes on the left. f(3) is a direction, not anything you have to adjust or manipulate.
Solution
f(-3) = 9*(-3^2) - 5*(-3) + 3 (-(3))^2 = -3 * -3 = 9 two minuses make a +
f(-3) = 9*(-3)(-3) + 15 + 3 -3 times an operation of minus equals a +
Roland; 20+15+16=51, 51÷3= 17 Roland; 17 We divide 3 because it's the total number of grade she got. Jetta; 16+19+17=52, 52÷3= 17.1 Jetta; 17.1 So, probably Jetta got better grade than Rolanda
