Question

Factorised form of 144k² - 81 is __________.​

Answer 1

Answer:

The answer is $9(4k-3)(4k+3)$

Step-by-step explanation:

  $144k^2-81$

$=9(16k^2-9)$, factor out 9

$=9[(4k)^2-3^2]$, write in the form of $a^2-b^2$

$=9(4k-3)(4k+3)$, using $a^2-b^2=(a-b)(a+b)$

Answer 2

Answer:

(12k+9k)(12k-9k)

Step-by-step explanation:

144k² - 81

(12k)²-(9)²

(12k+9k)(12k-9k)