Question

pls give me the method guys ​

Answer 1

Answer:

Complete step by step answer:

We are given a number 64126412.

We have to find the least number which must be added to 64126412 so as to get a perfect square and also square root of the perfect square.

Now, we think about the nearest perfect square number and compare with the given number.

The first two digits are 6464 and it is a square of the number 88. It means the number at the tenth place of square root will be 88.

Now, we think about the unit place of the square root number.

Let the number at the unit place is 00.

If we square off the number 8080, the answer will be 64006400.

But it is less than the given number so this cannot be our number.

Let the number at the unit's place is 11.

If we square off the number 8181, the answer will be 65616561.

This number is greater than the given number. It means we have to subtract the given number from 65616561 to get that value which can be added to the number 64126412 to make it a perfect square.

Therefore, 6561−6412=1496561−6412=149

Hence, 149149 is the least number which must be added to 64126412 so as to get a perfect square.

The required number is 6412+149=65616412+149=6561.

Now we evaluate the square root of the number 65616561.

On factorisation, we get

6561−−−−√=3×3×3×3×3×3×3×3−−−−−−−−−−−−−−−−−−−−−−−√6561=3×3×3×3×3×3×3×3

Evaluate the square root. The numbers which are in the pair will come out from the square root.

That is,

6561−−−−√=3×3×3×3

6561=3×3×3×3

⇒6561−−−−√=81

Answer 2

Answer:

Q1 y=2x

y=notebook

x=pen

Q2 (viii) 5=2x

= -2x × (0×y)+5

so, ax= (-2x)

by= (0×y)

c= 5