Question

Find x+y=9 and xy=20
a) x²+y²
b) x²-y²

Answer 1

Answer:

your answer is x^2+y^2

Answer 2

Answer:

a)x²+y²=41 b)x²-y²=9

Step-by-step explanation:

x²+y²=(x+y)²-2xy

x²+y²=(9)²-(2×20)

x²+y²=81-40

x²+y²=41

As we know that x²-y²=(x+y)(x-y)

Then ,we have to find(x-y)

x²+y²=(x-y)²+2xy

41=(x-y)²+(2×20)

41=(x-y)²+40

41-40=(x-y)²

1=(x-y)²

(x-y)=√1

(x-y)=1

Now x²-y²=(x+y)(x-y)

x²-y²=(9)×(1)

x²-y²=9

I hope this will help you Mark it as BRAINLIEST answer