
Formula: Consider the product (a+b).(ab). (a+b).(ab) = a.a + b.a + a.(b) + b.b = a^{2} + ab  ab  b^{2} Therefore (a+b)(ab) = a^{2}b^{2} a^{2}b^{2 }=^{ }(a+b)(ab)
Directions: Solve the following problems. Also write at least ten examples of your own. 