Question

If 2x+3y=4 and xy=3 find value of 8x³+2y³.

Answer 1

Answer:

- 200

Step-by-step explanation:

8x³+27y³  = ( 2x+3y)(4x² + 9y² - 6xy) = ( 2x+3y){4x² + 9y² +12xy - 18xyxy }

= ( 2x+3y){ ( 2x+3y)² - 18xyxy } = 4 ( 4 - 18*3) = 4(-50) = - 200