Adrian C. answered • 08/07/13

Patient & Effective Math Tutor w/ Specialty in pre- alg to Calc 2

Generally, the product of two binomials is:

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

Here are some special cases as well:

(a + b)(a - b) = a^{2} - ab + ab - b^{2} = a^{2} - b^{2}

(a + b)(a + b) = a^{2} + 2ab + b^{2}