how can I factorise -90 to get 1
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5 x2 + 10 x- 9x -18 =0
5x(x+2) - 9 (x+2) = 0
(5x-9)(x+2) = 0
5x(x+2) - 9 (x+2) = 0
(5x-9)(x+2) = 0
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10x-9
5x^2+10x-9x-18=0
5x(x+2)-9(x+2)=0
5x-9=0 or x+2=0
x=9/5 or x=-2
5x^2+10x-9x-18=0
5x(x+2)-9(x+2)=0
5x-9=0 or x+2=0
x=9/5 or x=-2
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