Question

if x+y=5 and xy=6 the value of (x3-y3) is​

Answer 1

Heya!!!

( x³ - y³ ) = ( x + y )³ - 3xy ( x + y )

=>

( x³ - y³ ) = ( 125 ) - 90

=>

( x³ - y³ ) = 35

Answer 2

Answer:

Step-by-step explanation:

  given that xy=6

                    x=6/y-----------(1)

x + y = 5

(6/y) + y = 5

y^2 - 5y +6 = 0

calculating this we get y = 6

put value of y in equation (1) we get

             x = 1

 

now,  (3x+3y) = (3 + 18) = 21

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