x*2 - 6x + 9
x*2 -3x -3x +9
x(x-3) -3(x-3)
(x-3)(x-3)
Note also that x*2 - 6x + 9 is of the form a*2 -2ab + b*2 and so the factors are
(x-3) and (x-3)
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2x2 - 9x + 4 = (2x - 1)(x - 4)
127 easy math people
81
= 90 (9*10)
9 + 9 + 9 + 9 + 9 + 9 + 6 + 6 + 6 + 6 + 2 + 2 + 23 + 3 + 3 + 4 + 4 + 4 = 123