Factorise:
X^2+1/x^2+2x-2/x
20x^2-9x+1
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1)X²+1/x² +2 -2x-2/x
=(x+1/x)² - 2(x+1/x)
=(x+1/x)(x+1/x -2)..
2) 5x ( 4x -1) +1 ( 4x -1)
(5x+1 ) (4x-1)
=(x+1/x)² - 2(x+1/x)
=(x+1/x)(x+1/x -2)..
2) 5x ( 4x -1) +1 ( 4x -1)
(5x+1 ) (4x-1)
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