2x(2x - 1)
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(2x - 1)(4x + 1)
(2x - 9)(2x - 9) or (2x - 9)2
Notice that we can factor out 2x from both terms on the LH side: ... 4x2+6x=0. The greatest common factor of 4 and 6 is 2 . The greatest common factor of x2 and x ...
x2 - 4x - 21 = (x-7)(x+3)
2(x - 1)(2x + y)