To solve the equation by factoring, we first rearrange it to set it to zero:
Next, we can factor out the greatest common factor (GCF), which is :
This gives us one solution immediately:
Now we need to factor the quadratic . We look for two numbers that multiply to 3 (the constant term) and add to 4 (the coefficient of x). The numbers that satisfy this condition are 1 and 3.
Thus, we can rewrite the quadratic as: