Question

factorisation:12m²-27​

Answer 1

take common in this

3(4m^2-9)

3*(2m)^2-3^2

3*2m-3*2m+3

Answer 2

Hello Dear Brainly user...

Question

is to factorise 12m² -27

Solution :-

we know that :

a² - b² = (a+b)(a-b)

By Frist method :-

=> 12m² - 27 = 0

=> 12m² = 27

=> m² = 27/12

=> m² = 9/4

=> m² = (3/2)²

=> m = ± 3/2 Answer

By 2nd Method

=> 12m² - 27 = 0

=> 3(4m² - 9) = 0

=> 4m² - 9 = 0

=> (2m)² - 3² = 0

=> (2m -3)(2m+3) = 0

=> 2m - 3 = 0 & 2m + 3 = 0

=> m = 3/2 & m = -3/2

=> m = ± 3/2 Answer

Hope it will help you :-)