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Anonymous
As written, that's 4x squared = -21 and x equals the square root of -21/4.
But if you meant that to be 12x, it factors out nicely to (2x + 3)(2x + 3) and x would equal -3/2
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4x2+50x = 0 4x(x+12.5) = 0 x = 0 or x = -12.5
dont know sorry
(2x + 3)(2x + 3)
-((4x + 1)(x - 1))
4x2 - 2x = 0