5x2 + 9x + 4 = (x + 1)(5x + 4).
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-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)
5x2 + 20x = 5x (x + 4)
3
9x + 4 - x + 8 = 8x + 12
9x + 4 = 6 9x = 6 -4 9x = 2 x = 2/9