(5x + 1)2 = 25x2 + 10x + 1
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That expression is the square of (5x + 1), so both of its factors are the same.
5x2+11x+2 = (5x+1)(x+2) when factored
(5x - i)(5x + i) where i is the imaginary unit equivalent to the square root of negative one.
(5x - i)(5x + i) where i is the imaginary unit equivalent to the square root of negative one.
5x-1+2= 5x+1