Question

If x+y+z=9 and xy +yz +zx=23, then x2+y2+z2 =?
(a) 35 (b) 58 (c) 127 (d) None of these

Answer 1

from a secret method

81- 23×2

= 81-46

= 35

$\bold{\boxed{Answer}}$

$\color{yellow}{a.35}$