Question

expand:(x+y-z)^2
please guys give a correct answer​

Answer 1

Answer:-

x²+y²-z²

Here's the answer

Answer 2

Answer:

x² + y² - z² + 2xy

Step-by-step explanation:

(x + y -z )²

⇒ ( x + y - z ) · ( x + y - z )

⇒ [x(x+y-z)] + [y(x+y-z)] + [z(x+y-z)]

⇒ [x² + xy - xz] + [xy + y² - yz] + [xz + yz - z²]

⇒ x² + xy -xz + xy + y² - yz + xz + yz - z²

⇒ x² + y² - z² + xy + xy -yz + yz -xz + xz

⇒ x² + y² - z² + 2xy