Factoring of 9x²-49
\(\boxed{\color{BurntOrange}{a^2-b^2 =(a-b)(a+b)}}\\ 9x^2 - 49\\ = (3x)^2 - 7^2\\ =(3x-7)(3x+7)\)
That formula is cookie-coloured :D
~The smartest cookie in the world
