Answer:
Plug in those values for the x in the equations.
Step-by-step explanation:
f(x) = x^2 + x
(x = -1) :: f(-1) = (-1)^2 + (-1)
f(-1) = -1 + -1
f(-1) = -2
(x = 2) :: f(2) = (2)^2 + (2)
f(2) = 4 + 2
f(2) = 6
f(x) = x^2 - x
(x = -1) :: f(-1) = (-1)^2 - (-1)
f(-1) = 1 - (-1)
f(-1) = 2
(x = 2) :: f(2) = (2)^2 - (2)
f(2) = 4 - 2
f(2) = 2
f(x) = -x^2 - x
(x = -1) :: f(-1) = -(-1)^2 - (-1)
f(-1) = -1 + 1
f(-1) = 0
(x = 2) :: f(2) = -(2)^2 - (2)
f(2) = -4 - 2
f(2) = -6
