Question

solve it fast...................​

Answer 1

Solution :-

Provided :-

• x + y - z = 2

• xy - yz - zx = -3

Now as we know

( x + y - z)² = x² + y² + z² + 2( xy - yz - zx )

→ x² + y² + z² = (x + y - z)² - 2( xy - yz - zx )

→ x² + y² + z² = (2)² - 2(-3)

→ x² + y² + z² = 4 - (-6)

→ x² + y² + z² = 10

Answer 2

Answer:

(x+y+-z)^2 = x^2 + y^2 +z^2 +2xy - 2yz -2zx

by putting values

answer=10