Two numbers have the following properties: the second number is three more than the first number and the product of the two numbers is 9 more than their sum. what are the two numbers?



Answer :

The two numbers will be either 3 and 6 or -4 or -1.

Let the two numbers be x and y.

According to the given question.

The second number is three more tahn the first number.

⇒ y = x + 3 ...(i)

Also,

The product of the two numbers is 9 more than their sum.

⇒ xy = 9 + (x + y)

Substitute the value of y = x + 3 in xy = 9 + (x + y)

⇒ x(x + 3) = 9 + ( x + x + 3)

⇒ x^2 + 3x = 9 + 2x + 3

⇒ x^2 + 3x = 12 + 2x

⇒ x^2 + x - 12 = 0

⇒ x^2 + 4x -3x - 12 = 0

⇒ x(x + 4) -3(x + 4) = 0

⇒ (x - 3)(x + 4) = 0

⇒ x = 3 or x = -4

Therefore,

when x = 3

y = 6

and

when x = -4

y = -4 + 3

⇒ y = -1

Hence, the two numbers will be either 3 and 6 or -4 or -1.

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