Page 47 - CITS - WCS - Electrical - Hindi

वक शॉप कै लकु लेशन & साइंस - CITS

2
§ 1
= 36
§ 1
·
·
2
a ¨ ¸ (a) 2 ¨ ¸
© a ¹ © a ¹
1
a + - 2 = 36
2
a 2
1
a + = 36 +2
2
a 2
1
a + = 38
2
a 2
1 1
7 If x - = 2, Find the value of x -
3
x 3
x
(a - b) = a - b - 3 ab (a - b)
3
3
3
§ 1 · 3 3 1 § 1 § · 1 ·
¨ x ¸ x (3 x) ¨ . ¨ ¸ x ¸
© x ¹ x 3 © x © ¹ x ¹
1
3 § 1 ·
= x -3 ¨ x ¸
3
x © x ¹
1 § 1 ·
3
3
2 = x -3¨ x ¸
3 © x ¹
x
1
3
8 = x -3 2
3
x
1
3
8 = x -6
3
x
1
3
8+6 = x
3
x
1
3
14 = x
3
x
1
3
x = 14
3
x
1 4 1
8 If x 4
= 4, Find the value of x + x
x x 4
1
x - = 4 (take square on both sides)
x 2
§ 1· = 4 [(a - b) = a + b - 2ab]
2
2
2
2
¨ x ¸
© x ¹
2 1 1 2
x 2 x x x 4
2 x
x
1
2
x 2 16
2
x
1
x 2 16 2
2
x
35
CITS: WCS - इले कल - अ ास 4