(x + 1)(5x - 1)
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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)
It is 4x^2 + 10x - 1
5x2-46x+9 = (5x-1)(x-9)
4x + 16 + 1 = 4x + 17 which cannot be factorised.
It is: 4x(1+4)