Factors-9

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Express (x 2 - 5x + 7) (x2 + 5x - 7) as a difference of two squares.

Solution :

(x2 - 5x + 7) (x2 + 5x - 7)

= [x2 - (5 x - 7)] [x2 + (5 x - 7)]

= (x2) 2 - (5x - 7)2

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