Question

If x+y=12,and xy =22,find x^2+y^2​

Answer 1

Here,

x+y=12 and xy=22

we know that,

`\tt{(x+y)^2=x^2+y^2+2xy }` ⠀

according to the question,

`\tt{ (12)^2=x^2+y^2+2×22 }` ⠀

`\tt{ x^2+y^2=144-44 }` ⠀

`\tt{x^2+y^2=100 }` ⠀