Factorise 81-x^2-y^2-2xy
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=81-x^2-y^2-2xy
=(9^2)-1(x^2+y^2+2xy)
=(9)^2-(x+y)^2
=(9-x+y)(9+x+y)
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=(9^2)-1(x^2+y^2+2xy)
=(9)^2-(x+y)^2
=(9-x+y)(9+x+y)
HERE IS YOUR ANSWER
•••••••••••••••
LIKE AND COMMENT
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