Question

Daca a+b=3v3 si b+c=-2v3,calculati: 2a+5b+3c

*v=radical

Answer 1

$a+b=3\sqrt3 \\ b+c=-2\sqrt3 \\ 2a+5b+3c=? \\ a=3\sqrt3-b \\ c=-2\sqrt3-b \\ 2a+5b+3c=3\sqrt3-b+5b-(-2\sqrt3)-b =\boxed{\bold{3b+5 \sqrt3}}$