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Anonymous
-5x2+9x-4
-5x2+9x+-4
Factors of -20 that add to equal 9 are -5 and-4
-5x2+5x+4x+-4
-5x(1x+1) + 4x(1+-1x)
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5x2 + 20x = 5x (x + 4)
5x2-46x+9 = (5x-1)(x-9)
5x(x+3)
(5x - 7)(x + 3)
(5x - 4)(x - 5)