First evaluate the left-hand side expression for *x* = 11: (11 - 9)^{2} = (2)^{2} = 4 Then evaluate the right-hand side expression for *x* = 11: 11 - 7 = 4 Because the left-hand and right-hand expressions match (evaluate to the same number) for *x* = 11, 11 is a solution to the equation (*x* - 9)^{2} = *x* - 7. We can hang onto this one, and don't need to recycle it. Which is a shame, because we could have gotten 10 cents for it down at the grocery store. |