x2-6x+9 = (x-3)(x-3) when factorised.
x^2-6x+9 (x-3)(x-3)
(x - 3)(x - 3)
(x + 3)(x + 3)
(x - 3)(x - 3)
x2-6x+9 = (x-3)(x-3) when factorised.
(x + 3)(x + 3)
x^2-6x+9 (x-3)(x-3)
3(x2 - 2x + 3)
(x - 3)(x - 3)
(x+3)(x+3)
That factors to (x + 3)(x + 3)
(x + 3)(x + 3)
x2 + 6x + 9 = 81 x2 + 6x = 72 x2 + 6x - 72 = 0 (x+12)(x-6) = 0 x= -12, 6 (two solutions)
3X2 + 6X + 9 3(X2 + 2 + 3) -----------------------3 is a common factor of all terms
With great difficulty not knowing if 6x and 27 are plus or minus
x2-6x-27 = (x+3)(x-9) when factored