Question

plzz show the copy work.....................​

Answer 1

Answer:

Let, the two numbers be x and y.

Here, x + y = 9. ....(1)

x × y = 20. ....(2)

(I)

${x}^{2} + {y}^{2} = {(x + y)}^{2} - 2xy$

${x}^{2} + {y}^{2} = 81 - 40 = 41$

(II)

${x}^{3} + {y}^{3} = {(x + y)}^{3} - 3xy(x + y)$

${x }^{3} + {y}^{3} = 729 - 60 \times 9$

${x }^{3} + {y}^{3} = 729 - 540 = 189$