Question

is the attached problem correct?​

Answer 1

Answer:

no it's wrong it's an factorisation question their is formula

hope this helps you

Answer 2

Answer:

No....

correct answer =>x² + y² + 2xy - z²

Step-by-step explanation:

(x+y+z) (x+y-z)

let (x+y) = a

=> (x+y+z) (x+y-z)= (a + z ) ( a-z)

using identity (m²-n²) = (m+n)(m-n)

= ( a² - z²)

putting value of a

we get

=> (x+y)² - z²

= (x² + y² + 2xy ) - z²

= x² + y² + 2xy - z²