Question

solve using identity(2x+3)³-(2x-3)³ class 9​

Answer 1

Answer:

given, (2x+3)³ - (2x -3)³

now using the formula (a+b)³ and (a-b)³ we get,

{(2x)³+3³+3.(2x).3(2x+3)} - {(2x)³-3³-3.(2x).3(2x-3)}

{8x³+27+18x(2x+3)} - {8x³-27-18x(2x-3)]

{8x³+27+36x²+54x} - {8x³-27-36x²+54x}

8x³+27+36x²+54x -8x³+27+36x²-54x

36x²+36x²27+27

72x²+54//