Advertisements
Advertisements
Question
Find the square of the following number using the identity (a − b)2 = a2 − 2ab + b2:
395
Advertisements
Solution
Decomposing: 395 = 400 − 5
Here, a = 400 and b = 5
Using the identity (a − b)2 = a2 − 2ab + b2:
3952 = (400 − 5)2 = 4002 − 2(400)(5) + 52 = 160000 − 4000 + 25 = 156025
APPEARS IN
RELATED QUESTIONS
Find the square root of the following number by division method.
3481
Find the square root of the following number by division method.
3249
Find the square root of the following number by division method.
576
Find the least number which must be added to the following number so as to get a perfect square. Also find the square root of the perfect square so obtained.
252
A gardener has 1000 plants. He wants to plant these in such a way that the number of rows and the number of columns remain same. Find the minimum number of plants he needs more for this.
These are 500 children in a school. For a P.T. drill they have to stand in such a manner that the number of rows is equal to number of columns. How many children would be left out in this arrangement?
Find the square root the following by long division method:
1745041
Find the square root of 7.832 correct to: 2 decimal places
Find the square root by long division method
6889
Find the square root of the following by long division method.
27.04
