Simplify the following expression: ( 3over a+3a )( 9over a²-9+9a² )\ if a = 1

Simplify the following expression: ( 3over a+3a )( 9over…

Simplify the following expression:

${\left( {3\over a}+3a \right)}{\left( {9\over a^2}-9+9a^2 \right)}\$ if a = 1

Show answer & explanation

Correct answer: D

Explanation

The correct answer is option 4 i.e. 54.

Given,

a = 1

⇒ ${\left( {3\over 1}+3(1) \right)}{\left( {9\over 1^2}-9+9(1)^2 \right)}\$

⇒ (3 + 3)(9 - 9 + 9)

⇒ 6 × 9 = 54