Factoring

	Difference of two squares:		$\displaystyle x^2-y^2 = (x+y)(x-y)$
	Difference/sum of two cubes:		$\displaystyle x^3\pm y^3 = (x\pm y)(x^2\mp xy+y^2)$
	Difference of two fourth powers:		$\displaystyle x^4-y^4=(x^2-y^2)(x^2+y^2)=(x+y)(x-y)(x^2+y^2)$
	Perfect square trinomial:		$\displaystyle x^2\pm 2xy+y^2 = (x\pm y)^2$
	Factoring by Grouping:		$\displaystyle acx^3+adx^2+bcx+bd=ax^2(cx+d)+b(cx+d)=(ax^2+b)(cx+d)$