UNIVERSAL METHOD TO FIND SQUARE OF ANY NUMBER:
METHOD 1:
1. 1. a²/2ab/b²
Example:
Que 1 : Find (46)²
Soln:
Here a= 4
Here a= 4
& b=6
(46)² = 4² / 2 X 4 X 6 / 6²
= 16 / 48 /36
// 16+4 + carry(1) / 1 / 6
=2116 ans.
Example:
Que2 : Find (116)²
Soln:
Here a= 11
Here a= 11
& b=6
(116)² = 11² / 2 X 11 X 6 / 6²
= 121 / 132 / 36
// 121+13 / 5 / 6
=13456 ans.
Example:
Que3 : Find (22)²
Soln:
Here a= 2
Here a= 2
& b=2
(22)² = 2²/ 2 X 2 X2 /2²
= 4/8/4
= 484 ans.
Example:
Que3 : Find (10002)²
Soln:
Here a= 1000
Here a= 1000
& b=2
(10002)² = 1000² / 2 X 1000 X2 / 2²
= 1000000 / 4000 / 4
= 100040004 ans
METHOD 2:
1. (a + b)² = a² + 2ab + b²
Example:
Que1 : Find (25)²
Soln:
25 = 20 + 5
Here a= 20
Here a= 20
& b=5
(25)² = 20² + 2 X 20 X 5 + 5²
= 400 + 200 + 25
= 625 ans.
Example:
Que2 : Find (1003)²
Soln: 1003 = 1000 + 3
Here a= 1000
Here a= 1000
& b=3
(1003)² = 1000² + 2 X 1000 X 3 + 3²
= 1000000 + 6000 + 9
= 1006009 ans
2. (a - b)² = a² - 2ab + b²
Example:
Que1 : Find (19)²
Soln:
19 = 20 - 1
Here a= 20
Here a= 20
& b=1
(19)² = 20² + 2 X 20 X 1 + 1²
= 400 - 40 + 1
= 361 ans.
Example:
Que2 : Find (97)²
Soln: 97 = 100 - 3
Here a= 100
Here a= 100
& b=3
(97)² = 100² - 2 X 100 X 3 + 3²
= 10000 – 600 + 9
= 9409 ans
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