Question 134910
given : {{{a^2+2ab-3b^2}}}
{{{a^2+2ab-3b^2}}}
{{{(a+3)(a-1)}}}

On this type of problem, since the coefficient for the a^2 term is 1, you are looking for factors of 3 that sum to 2. The factors of 3 are 1 and 3. 3-1 equal 2.

Make sense?