Question

factorise 12-(a+a^2) (8-a-a^2)​

Answer 1

Answer:

Step-by-step explanation:

Put u = x² + x.

Then

 12 - ( x + x² ) ( 8 - x - x² )

= 12 - u ( 8 - u )

= u² - 8u + 12

= ( u - 2 ) ( u - 6 )

= ( x² + x - 2 ) ( x² + x - 6 )

= ( x - 1 ) ( x + 2 ) ( x - 2 ) ( x + 3 )

: )