5x4 - 2x = x*(5x3 - 2) and that cannot be factorised further without invoking surds.
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It is: 4(2x+3m) when factorised
(x - 3)(2x - 7)
we factorise a number by finding the common factor. example: 2x+6 = 2 is the common factor the 2 is then put outside the bracket 2x+6 = 2(x+3)
4x2 + 12x + 5 = 4x2 + 2x + 10x + 5 = 2x(2x+1) + 5(2x+1) = (2x+1)(2x+5)
It is: (2x+5)(x-3) when factored