factorise,.
81x^4-y^4
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(9x^2)^2-(y^2)^2
=(9x^2+y^2) (9x^2-y^2)
=(9x^2+y^2)(3x+y)(3x-y)
=(9x+y)^2-2.9x.y [(3x+y)(3x-y)]
(a^2-b^2)=(a+b)(a-b)
using this formula....↑↑↑↑↑
I think it will help you
=(9x^2+y^2) (9x^2-y^2)
=(9x^2+y^2)(3x+y)(3x-y)
=(9x+y)^2-2.9x.y [(3x+y)(3x-y)]
(a^2-b^2)=(a+b)(a-b)
using this formula....↑↑↑↑↑
I think it will help you
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