Question

x=2+✓3,y=2-✓3 then calculate the simplified value of 3x²-5xy+3y²

Answer 1

the value will be 37
Hope it will help...

Answer 2

3x²-5xy+3y²
3(2+√3)²-5(2+√3)(2-√3)+3(2-√3)²
3(4+3+4√3)-5(4-3)+3(4+3-4√3)
3(7+4√3)-5+3(7-4√3)
21+12√3-5+21-12√3
21+21-5
42-5
37

I think it is useful for u