Question

Expand using suitable identity
(5x-7y-2z)²
Plz tell correct answer. If u don't know, just ignore this question. Don't answer wrong.​

Answer 1

Answer:

identity is (a+b+c)Ka square

Step-by-step explanation:

that is a square plus b square plus c square 2ab +2bc+2ca

Answer 2

↣ SoLuTiOn :-

We know that :-

( a + b + c )² = a² + b² + c² + 2ab + 2bc + 2ac

Here :-

a = 5x

b = - 7y

c = - 2z

⇝ ( 5x - 7y - 2z )² ⤵️

= ( 5x )² + ( -7y )² + ( -2z )² + ( 5x × -7y ) + ( -7y × -2z ) + ( 5x × -2z )

= 25x² + 49y² + 4z² + ( - 35xy ) + ( 14yz ) + ( - 10xz )

= 25x² + 49y² + 4z² - 35xy + 14yz - 10xz