Math, asked by harshika6037, 8 months ago

if x-y = 5 and xy= -6 find the value of x cube - y cub

Answers

Answered by Anonymous
0

Step-by-step explanation:

x - y = 5

x = 5+ y

xy = -6

(5+y) y = -6

5y + y ^2 = -6

y^2 +5y+6=0

y^2+3y+2y+6=0

(y+3) (y+2) = 0

y = -3 or -2

let y = -2

therefore,

x= 5+y

x = 5-2

x= 3

x^3 - y^3 = 3^3 - (-2)^3

= 27 + 8

= 35

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