To find two square numbers that subtract to make 21, we can set up the equation x^2 - y^2 = 21, where x and y are the square roots of the square numbers. This equation can be factored as (x + y)(x - y) = 21. The factors of 21 are 1, 3, 7, and 21, so we can set up different pairs of equations to solve for x and y. The solutions are x = 5 and y = 2, which means 25 - 4 = 21.
39
sum of 14th square number and 10th square number
The rule is: add 5, subtract 2, add 5, subtract 2, . . . Next number is 24.
14. If you have the numbers in order like so: 7,9,11,14,21 you can see that 21 is the greater number. You then subtract 21 from the smallest number, 7, and you get 14.
21
They are: 25 minus 4 = 21
They are: 25-4 = 21
25 and 4 or 121 and 100
The inverse operation of adding 21 is subtracting 21. This means that if you subtract 21 from a number, and then add 21 to the result, you will get back to the original number.
There is no such number.
4 and 25 are.
39
21 is not the square of an integer. The closest square number is 25.
No, 21 is not a square number. A square number is the result of multiplying an integer by itself, and 21 cannot be expressed as the square of an integer.
21
It can be if the first number is x + 21 and the second is x for any number x.
112 - 102 = 21