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x+3-x= x-x+3 = 3
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X2+3x+x+3=x(x+1)+3(x+1)=(x+3)(x+1)
x + x + 1 + x + 2 + x + 3 = -144x + 6 = 144x = 8x = 2
(x+3)(x+4) = x²+7x+12
x + 3 + 10 = x + 13
It is: x^2 -9 = (x +3)(x -3)