Question

If 400 is subtracted from the square of the number.The answer obtained is 4321.What is the number?

Answer 1

Answer:

sorry I was not a answer

Answer 2

Answer:

The required number is 68.70.  

Step-by-step explanation:

Given : If 400 is subtracted from the square of the number.The answer obtained is 4321.

To find : What is the number?

Solution :

Let the number be 'x'.

According to question,

If 400 is subtracted from the square of the number.

i.e. $x^2-400$

The answer obtained is 4321.

i.e. $x^2-400=4321$

Solve the equation,

$x^2=4321+400$

$x^2=4721$

Taking root both side,

$x=\sqrt{4721}$

$x=68.70$

Therefore, The required number is 68.70.