If P(x) is a quadratic polynomial such that P(1) = 8, P(2) = 13 and coefficient of x2 is 1, then the value of P(3) is यदि P(x) द्विघात बहुपद है जबकि P(1) = 8, P(2) = 13 तथा x2 का गुणांक 1 है, तब P(3) का मान है