Question 557885
subtracting x ___ √x = 20 - x


squaring ___ x = 400 - 40x + x^2


subtracting x ___ 0 = x^2 - 41x + 400


factoring ___ 0 = (x - 25)(x - 16)


x = 25 ___ AND ___ x = 16


remember -- square roots can be positive OR negative