Q10 of 186 Page 4

Two numbers differ by 4 and their product is 96. Find the numbers.

Let the two numbers be x and y.

According to the question,


x – y = 4 …(i)


Also, x×y = 96


…(ii)


On putting the value of in Eq. (i), we get



⇒ 96 – y2 = 4y


⇒ y2 + 4y – 96 = 0


⇒ y2 + 12y – 8y – 96 = 0


⇒ y(y + 12) – 8(y + 12) = 0


⇒ (y – 8)(y + 12) = 0


⇒ y = – 8 and 12


But y = – 8 can’t be the one number as it is given that the numbers are positive.



Hence, the two numbers are 8 and 12.


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