Math, asked by nikhilvk, 1 year ago

x³+y³ = 91, x+y=7 then xy=?

Answers

Answered by abhi569

(x+y) = 7

cube on both sides,

(x+y)^3 = 7^3

by formula,

x^3 +y^3 +3xy(x+y) = 343

put the values which are given,

91+21xy = 343

21xy = 343-91

21xy = 252

xy= 252/21

12 = xy

abhi569: your welcome nova

nikhilvk: abhi which formula you used

abhi569: hi

abhi569: (a+b)^3

abhi569: is used here

Answered by kshitijNGU

I Hope it will help u

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