When factorizing a quadratic equation you need to try and find 2 numbers that add up to give the 2nd term and times together to give the 3rd term. We can find these 2 numbers by looking at the factors of the 3rd term and seeing which factor works.In this example, we need to find 2 numbers that add up to give 5 and times together to give 6. We can then deduce that 3 and 2 fit the description. So we end up with (X+3)(X+2).