Formulas / Equations

$ka + kb + kc = k(a+b+c)$

$ac+ad+ bc + bd = (a+b)(c+d)$

$a^2\pm 2ab + b^2 = (a\pm b)^2$

$(a^2\pm 2ab+b^2)-c^2 = (a\pm b + c)(a\pm b - c)$

$a-b = (\sqrt{a}-\sqrt{b})(\sqrt{a}+\sqrt{b})$

$a^3\pm3a^2b+3ab^2\pm b^3 = (a\pm b)^3$

$a^3\pm b^3 = (a\pm b)(a^2\mp ab + b^2)$