Question

Expand-: (-2a+3b+4c)

Answer 1

here is ur answer:-

( 2a + 3b + 4c )²

dear , we need a formula which is

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

now ,

( 2a )² + ( 3b )² + ( 4c )² + 2 { ( 2a.3b + 3b.4c + 4c.2a ) }

= 4a² + 9b² + 16c² + 2 { ( 6ab + 12bc + 8ca )}