x + 1/x = 2 হলে x4 + 1/x4 এর মান কত?
A
1
B
0
C
2
D
1/2
উত্তরের বিবরণ
প্রশ্ন: x + 1/x = 2 হলে x4 + 1/x4 এর মান কত?
সমাধান:
দেওয়া আছে,
x + (1/x) = 2
⇒ {x + (1/x)}2 = 22 [বর্গ করে] [(a + b)2 = a2 + 2ab + b2]
⇒ x2 + 2 × x × (1/x) + (1/x)2 = 4
⇒ x2 + (1/x2) = 4 - 2
⇒ {x2 + (1/x2)}2 = 22 [আবার বর্গ করে]
⇒ (x2)2 + 2 × x2 × (1/x2) + (1/x2)}2 = 4
⇒ x4 + 1/x4 = 4 - 2
∴ x4 + 1/x4 = 2
0
Updated: 1 month ago
Four girls are sitting on a bench to be photographed. Asma is to the left of Rani. Rubi is to the right of Rani. Rita is between Rani and Rubi. Who would be third from the left in the photograph?
Created: 1 day ago
A
Rita
B
Rani
C
Asma
D
Rubi
Question: Four girls are sitting on a bench to be photographed. Asma is to the left of Rani. Rubi is to the right of Rani. Rita is between Rani and Rubi. Who would be third from the left in the photograph?
Solution:
Asma is to the left of Rani.
Asma ⇔ Rani
Rubi is to the right of Rani.
Rani ⇔ Rubi
Rita is between Rani and Rubi.
Rani ⇔ Rita ⇔ Rubi
∴ Asma ⇔ Rani ⇔ Rita ⇔ Rubi.
Rita would be third from the left in the photograph
0
Updated: 1 day ago
যদি
Created: 1 week ago
A
47
B
49
C
51
D
57
0
Updated: 1 week ago
3x2 - 10x - 8 এর উৎপাদকে বিশ্লেষণ কোনটি?
Created: 1 week ago
A
(3x - 2)(x + 4)
B
(3x + 2)(x - 4)
C
(3x + 4)(x - 2)
D
(3x - 4)(x + 2)
প্রশ্ন: 3x2 - 10x - 8 এর উৎপাদকে বিশ্লেষণ কোনটি?
সমাধান:
3x2 - 10x - 8
= 3x2 - 12x + 2x - 8
= 3x(x - 4) + 2(x - 4)
= (3x + 2)(x - 4)
0
Updated: 1 week ago
