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) = a2 - ab + ab - b2 = a2 - b2
(a + b)(a + b) = a2 + 2ab + b2