যদি (x - 5)(a + x) = x2 - 25 হয়, তবে a এর মান কত?
A
- 5
B
5
C
25
D
- 25
উত্তরের বিবরণ
প্রশ্ন: যদি (x - 5)(a + x) = x2 - 25 হয়, তবে a এর মান কত?
সমাধান:
(x - 5) (a + x) = x2 - 25
⇒ (x - 5) (a + x) = (x - 5)(x + 5)
⇒ a + x = x + 5
∴ a = 5
0
Updated: 4 months ago
A solution contains 25% sugar by weight is made sweeter by doubling the amount of sugar. The percent of sugar, by weight, in the new solution is-
Created: 1 day ago
A
33.33%
B
32%
C
40%
D
23.27%
Question: A solution contains 25% sugar by weight is made sweeter by doubling the amount of sugar. The percent of sugar, by weight, in the new solution is-
Solution:
let, solution is 100 unit
amount of sugar = 100 × 25%
= 100 × (25/100)
= 25 unit
by doubling, amount of sweet = 50 unit
∴ solution now = 100 + 25 = 125 unit
∴ percent of sugar = {(50 × 100)/125}% = 40%
0
Updated: 1 day ago
In what ratio should a mixture of 20% alcohol strength be mixed with a mixture of 60% alcohol strength to get a mixture of 50% alcohol strength?
Created: 1 day ago
A
1 : 2
B
3 : 2
C
1 : 3
D
2 : 3
Question: In what ratio should a mixture of 20% alcohol strength be mixed with a mixture of 60% alcohol strength to get a mixture of 50% alcohol strength?
Solution:
Let the ratio be 1 : x
Then according to the question
⇒ 20 × 1 + 60x = (1 + x) 50
⇒ 20 + 60x = 50 + 50x
⇒ 60x - 50x = 50 - 20
⇒ 10x = 30
⇒ x = 3
∴ the ratio is 1 : 3
0
Updated: 1 day ago
y3 - 2√2 এর একটি উৎপাদক নিচের কোনটি?
Created: 1 week ago
A
y + √2
B
(y2 + 2√2 + 2)
C
y - 2
D
y - √2
প্রশ্ন: y3 - 2√2 এর একটি উৎপাদক নিচের কোনটি?
সমাধান:
y3 - 2√2
= y3 - (√2)3
= (y - √2)(y2 + y√2 + (√2)2)
= (y - √2)(y2 + y√2 + 2)
0
Updated: 1 week ago
