Question

If x + y = 10 and xy = 21, find 2(x2 + + y2).​

Answer 1

Step-by-step explanation:

let us take

x=7 ,y=3

x+y =10

7+3= 10

then,

xy=21

7x3=21

then,

2(x2 +y2)

=2(7x2+3x2)

=2(14+6)

=2(20)

=2x20

=40

it your answer