how to factorise 5(x/x+1)²-4(x/x+1)-1
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use b2-4ac formula and expand it
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let (x/x+1)=a
5a^2-4a-1
5a^2-5a-a-1
5a(a-1) 1(a-1)
(5a+1) (a-1)
5a^2-4a-1
5a^2-5a-a-1
5a(a-1) 1(a-1)
(5a+1) (a-1)
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