Factorise 36(x+y)2-49(x-2y)2
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Step-by-step explanation:
= {6(x+y)}^2 -{7(x-2y)}^2 a^2-b^2= (a+b) (a-b)
= {6(x+y)+7(x-2y)} {6(x+y)-7(x-2y)}
=(6x+6y+7x-14y) (6x+6y-7x+14y)
=(13x-8y) (-x+20y)
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