>> THE OTHER OPTION IS IF YOU DON’T WANT TO FACTOR, YOU CAN USE THE QUADRATIC. >> THE PROFESSOR HAS BEEN TEACHING MATH FOR 25 YEARS. WHEN HE APPLIED, HE KNEW EXACTLY WHAT HE WANTED TO USE THE SEMESTER OR. -- SEMESTER FOR. TUTORING HIGH SCHOOL IS FOR THE SATS. >> IT IS NOT THE NORM TO GET OUTSIDE HELP REALLY MADE THE FEEL GREAT ABOUT WHAT I WAS DOING. >> AS HE VOLUNTEERED, HE NOTICED THE KIDS WHO DID NOT HAVE CALCULATORS OF THEIR OWN. >> THIS CAP LATER YOU CAN DO FIVE RAISED TO THE FOURTH AND THAT GIVES YOU THE ANSWER. >> I HAVE THIS JACKET NEXT TO ME SO IT IS EASIER TO FOCUS. IF A CALCULATOR CAN HELP YOU WITH TWO OR THREE QUESTIONS ON THE SAT, THAT MIGHT BE THE DIFFERENCE BETWEEN A 490 AND 520 , WHICH OPENS UP A WHOLE NEW SET OF APPLICATIONS. >> EASILY HAD ENOUGH KIDS IN THE CLASS AND PROJECTED ABOUT 250 EXTRA. >> OTHERS READY TO TAKE THEIR SATS. >> HE PLANS TO GIVE OUT THESE TO ANY HIGH SCHOOL STUDENT WHO NEEDS IT GOING TO JUNIORS TAKING THE SATS. JUST BRING YOUR SCHOOL ID TO THE BOSTON PUBLIC LIBRARY ON SATURDAY, APRIL 27 COME -- FROM