Quote (feanur @ Feb 15 2018 04:49pm)
Basic rules :
(a + b)² = a² + 2ab + b²
(a - b)² = a² - 2ab + b²
(a + b)(a - b ) = a² - b²
See if it helps, and feel free to pm.
Good luck.
Yup got them down now.
Quote (Whiskers @ Feb 15 2018 06:39pm)
That's called difference of squares:
Code
a^2 – b^2 = (a + b)(a – b) or (a – b)(a + b)
Using your example:
Code
(x+10)(x-10) = x^2 - 10x + 10x - 100.
The -10x and +10x cancel out, so you're left with x^2 - 100.
Shit that looks so obvious when you put it that way
That was easy lol, but still I made it hard for me somehow