Question

if 2x+3y=8 XY=2 then find the value of (2x-3y)³​

Answer 1

Explanation:

Correct option is

A

40

Given

2x+3y=8 and xy=2,

formula,

(a+b)

2

=a

2

+b

2

+2ab

∴(2x+3y)

2

=4x

2

+9y

2

+2(2x)(3y)

(2x+3y)

2

=4x

2

+9y

2

+12xy

8

2

=4x

2

+9y

2

+12(2)

∴4x

2

+9y

2

=64−24=40