Question

Expand the following using a suitable identity ( 5x+ 6y)3​

Answer 1

Answer:

15x+18y

happy to help... hope it helps. plz mark as brainliest

#verified

#brainlyexpert

Answer 2

Answer:

Step-by-step explanation:

Given that,

( 5x + 6y )³

= ( 5x )³ + ( 6y )³ + 3 ( 5x )² ( 6y ) + 3 ( 5x ) ( 6y )² [∵(a + b)³ = a³+b³+3a²b+3ab² ]

= 125x³ + 216y³ + 3 ( 25x² ) ( 6y ) + 3 ( 5x ) ( 36y² )

= 125x³ + 216y³ + 450x²y + 540y² is the answer.