Question

Find the last number which must be subtract from 402 so as to get a perfect square. Also find the square root of the perfect square so obtained ?​

Answer 1

(i) 402

We know that, if we subtract the remainder from the number, we get a perfect square.

Here, we get the remainder 2. Therefore 2 must be subtracted from 402 to get a perfect square.

\therefore402-2=400∴402−2=400

Hence, the square root of 400 is 20.

$\huge\red{@alurringbabe}$

Answer 2

Answer:

400 (20)

Step-by-step explanation:

Lets do trial and error method.

19^2 = 361

20^2 = 400

21^2 = 441

We can see that 400 is the closest number to 402. Therefore, answer is 400 which is a perfect square of 20 and its sqr root is 20.