Question

if x+y= 10 and xy = 21, find the value of x square + y square

Answer 1

Answer:

Here,

Hey mate,

Step-by-step explanation:

We know that.

(x+y)²=x²+y²+2xy

-=> x²+y²=(x+y)²-2xy

• Given :

x+y=10 and xy=21

• Substituting these values...

=> x²+y²=(10)² -2(21)

=>100-42=58

• Now; Question is to find 2(x²+y²)

=>2(x²+y²)= 2(58)=116

Good day,

Hope it helps...

Thanks:)

Answer 2

Step-by-step explanation:

the above is your answer so mark me as a brainlist frnd