Question 326695
a(a+1) -3(a+1)
(a+1) is common in the expression
(a+1)(a-3)
..
9a^2 - 64b^2.
this can be written as
{{{ (3a)^2-(8b)^2 }}}
use the difference of squares formuls
{{{a^2-b^2=(a+b)(a-b)}}}
In our equation a corresponds to 3a & b corresponds to 3b
{{{ (3a+8b)(3a-8b)}}}