If I multiply a number by 10 and subtract 9,

I get the square of the number.

What could the number be?

The two numbers which satisfy the given statement are 1 and 9

Step-by-step explanation:

Given as:

A number is multiply by 10 and subtracted 9, then square of number is formed:

So, Let The number be x

Or, (10 * x) - 9 = x²

Or, 10 x - 9 = x²

Or, x² - 10 x + 9 = 0

Or, x² - x - 9 x + 9 = 0

Or, x (x - 1) - 9 (x - 1) = 0

so, (x - 1) (x - 9) = 0

∴ x = 1 and x = 9

Hence The two numbers which satisfy the given statement are 1 and 9 Answer

N = the number

10n - 9 = n2

0 = n2 - 10n + 9

0 = (n - 1) (n - 9)

{ 1, 9 }

The number could be either 1 or 9.