If x + y + z = 9, xy + yz + zx = 26, find x² + y² + z²
Answers
Answered by
0
Answer:
which grade it is sorry I don't know
Answered by
3
Answer:
(x+y+z)²=x²+y²+z²+2(xy+yz+xz)
x²+y²+z²=(x+y+z)²-2(xy+yz+zx)
given :x+y+z=9
xy+yz+xz=26
x²+y²+z²=(9)²-2(26)
x²+y²+z²=81-52
x²+y²+z²=29
Similar questions