Given that and are prime numbers and they are the roots of the quadratic equation
where is a constant. Then, , where and are positive coprime integers. What are the last 3 digits of ?
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q p + p q = p q p 2 + q 2 From the quadratic equation we get p + q = 6 1 . p q = m → ( p + q ) 2 = 6 1 2 → p 2 + q 2 = 3 7 2 1 − 2 p q = 3 7 2 1 − 2 m .So we can write the fraction as m 3 7 2 1 − 2 m If p , q = P r i m e N u m b e r s then one of p and q must be 2 because if p and q were both odd primes then p + q = E v e n N u m b e r = 6 1 ( A c o n t r a d i c t i o n ) .Let p=2 then q=61-2=59 and m=pq=(2)(59)=118.So we can write the fraction as 1 1 8 3 7 2 1 − 2 ( 1 1 8 ) = 1 1 8 3 7 2 1 − 2 3 6 = 1 1 8 3 4 8 5 → g c d ( 3 4 8 5 , 1 1 8 ) = 1 → a + b = 3 4 8 5 + 1 1 8 = 3 6 0 3