If 4x² + y² = 40 and xy = 6, then find the value of 2x + y.

if x+y =3 and then the value of (x²+y²) is :

Simplify the following expression.

if x⁴+y⁴+x²y²=21 and x²+y²-xy=7, then what is the value of  

If α, β are the roots of 6x²+13x+7=0, then the equation whose roots are α², β² is:

 if then find the value of

What is the value of a²+b²+c²-2ab-2bc+2ca?

if , then what is the value of