Question

what is the expansion of (a-b-c)2??

Answer 1

Hi ,

(a - b - c )^2

= ( a - b - c ) ( a - b - c )

= a ( a - b - c ) - b ( a - b - c ) - c ( a - b - c )

= a ^2 - ab - ac - ab + b ^2 + bc - ac + bc + c 2

= a ^2 + b ^2 + c ^2 - 2ab + 2bc - 2ac

Thetefore,

( a - b - c )^2 = a^2 + b ^2 + c ^2 - 2ab + 2bc - 2ac

I hope this will useful to you.

*****

Answer 2

Answer:

x ^2 + y ^2 + z ^2 - 2xy + 2yz - 2xz

Step-by-step explanation:

(x - y - z )^2

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

x ^2 - xy - xz - xy + y ^2 + yz - xz + xz + z^2

x ^2 + y ^2 + z ^2 - 2xy + 2yz - 2xz