if a/b+b/a =-1 then what is the value of. a3-b3
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=a^2/a+b+b^2/a+b=-1
=a^2 +b^2= -(a+b)
a^3-b^3 = (a^2+b^2)(a-b)+ab(a-b)
=-(a^2-b^2)+ab(a-b)
=(a-b)(ab-(a+b))
=a^2 +b^2= -(a+b)
a^3-b^3 = (a^2+b^2)(a-b)+ab(a-b)
=-(a^2-b^2)+ab(a-b)
=(a-b)(ab-(a+b))
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