Question 110475
{{{(x-3)^2 - 4(x-3)- 21 = 0}}}
:
FOIL (x-3)(x-3):
{{{(x^2 - 6x + 9) - 4(x-3)- 21 = 0}}}
:
{{{x^2 - 6x + 9 - 4x + 12 - 21 = 0}}}
:
{{{x^2 - 6x - 4x + 9 + 12 - 21 = 0}}}
:
{{{x^2 - 10x = 0}}}