2x + 7 + 5 = 2x + 12 = 2*x + 2*6 = 2*(x+6)
Do you mean 2x²? Assuming this is the case: 2x² - 3x + 8x - 12 = 2x² + 5x - 12 = (2x - 3)(x + 4)
2x + 6 = 2(x+3)
It is: 4(2x+3m) when factorised
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(x - 3)(2x - 7)
4x2 + 12x + 5 = 4x2 + 2x + 10x + 5 = 2x(2x+1) + 5(2x+1) = (2x+1)(2x+5)
(x-1)(2x+5)
8x + 20 = 4 (2x + 5)
It is 2(2x+3) when factorised
You cannot since the expression does not have rational roots.
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