Listen NCERT Audio Books - Kitabein Ab Bolengi
Find two consecutive positive odd integers whose product is 483.
Let the required consecutive positive odd integers be x and (x + 2)
According to given condition,
x (x + 2) = 483
x2 + 2x – 483 = 0
Using the splitting middle term – the middle term of the general equation is divided in two such values that:
Product = a.c
For the given equation a = 1 b = 2 c = – 483
= 1. – 483 = – 483
And either of their sum or difference = b
= 2
Thus the two terms are 23 and – 21
Difference = 23 – 21 = 2
Product = 23. – 21 = – 483
x2 + 2x – 483 = 0
x2 + 23x – 21x – 483 = 0
x (x + 23) – 21(x + 23) = 0
(x + 23) (x – 21) = 0
(x + 23) = 0 or (x – 21) = 0
x = – 23 or x = 21
x = 21 (x is a positive odd integer)
x + 2 = 21 + 2 = 23
Hence, the required integers are 21 and 23