Answers

2014-02-28T14:56:13+05:30
4x^2+2x-90
4x^2-18x+20x-90
2x(2x-9)+10(2x-9)
(2x-9)(2x+10)
Therefore, x=9/2 or x=-10/2
0
2014-02-28T14:56:28+05:30
4 x^{2} +2x -90
=4 x^{2} +(20-18)x -90
=4 x^{2} +20x-18x -90
=4x(x+5) - 18(x+5)
=(x+5)(4x-18)

x = -5,9/2
0