Question

expand using appropriate identity (4x+5y)²​

Answer 1

Answer:

as (a+b)² = a²+b²+2ab

(4x+5y)² = (4x)² + (5y)² + 2(4x)(5y)

= 16x² + 25y² + 40xy

Answer 2

Answer:

                     Here you go mate.

Step-by-step explanation:

As ( 4x + 5y )² is of form ( a + b )²   { where a is 4x and b is 5y }

we can substitute appropriate values in the Identity

            ( a + b )² = a² + b² + 2ab

( 4x + 5y )² = ( 4x )² + ( 5y )² + ( 2 × 4x × 5y )

                  =  16x² + 25y² + 40xy

                           Answer : 16x² + 25y² + 40xy

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