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Anonymous
Reciprocal in math means to flip a number. 2x can also be expressed as 2/1 (2 over 1) x. So the reciprocal of 2x is 1/2 (one over two) x.
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4
(2x - 3)(2x + 3)(2x-3)(2x+3)
Assuming that 4x2+2x = 0: 2x (2x+1) = 0 2x = 0 or 2x+1 = 0 x = 0 or -1/2
x=1
2x - y -(-1) = 2x - y + 1