They want you to find the x values that make
x^2 - 6x + 8 = x - 2
Pick a few values for x
f(x) g(x)
x = 0 0^2 - 6(0) + 8 = 8 0 - 2 = -2 not true
x =1 1^2 - 6(1) + 8 = 3 1 - 2 = - 1 not true
x = 2 2^2 - 6(2) + 8 = 0 2 - 2 = 0 true
x = 3 3^2 - 6(3) + 8 = 8 3 - 2 = 1 not true
x = 4 4^2 - 6(4) + 8 = 0 4 - 2 = 2 not true
x = 5 5^2 - 6(5) + 8 = 3 5 - 2 = 3 true
So x = 2 and x = 5 are the solutions