Question

x+y=7, xy=12,....find x3+y3

Answer 1

Answer: 91

Explanation:

x³ + y³ = (x + y)(x² + y² - xy)

= (x + y)((x + y)² - 3xy)

= 7(7² - 3×12) = 7(49 - 36)

= 7×13 = 91

Hope it helped