f(x) = x2 - 7x + 12 এবং f(x) = 0 হলে, x এর মান কত?
A
3, 9
B
- 3, 4
C
2, 6
D
3, 4
উত্তরের বিবরণ
সমাধান:
দেওয়া আছে,
f(x) = x2 - 7x + 12
এখন,
f(x) = 0
x2 - 7x + 12 = 0
= x2 - 3x - 4x + 12 = 0
= x(x - 3) - (x - 3) = 0
= (x - 3)(x - 4) = 0
∴ x = 3, 4
0
Updated: 1 month ago
P = {x, y, z, 0, 1} হলে, P এর প্রকৃত উপসেট কয়টি?
Created: 1 month ago
A
15
B
32
C
16
D
31
সমাধান:
P = {x, y, z, 0, 1} সেটের উপাদান সংখ্যা 5 টি।
আমরা জানি,
প্রকৃত উপসেট সংখ্যা = 2n - 1 ; [ n = উপাদান সংখ্যা ]
∴ P সেটের প্রকৃত উপসেট সংখ্যা = 25 - 1 = 32 - 1 = 31
0
Updated: 1 month ago
If n(U) = 50, n(A) = 28, n(B) = 26 and n(A ∩ B) = 12 then n(A ∪ B)′ = ?
Created: 1 month ago
A
8
B
14
C
26
D
42
Question: If n(U) = 50, n(A) = 28, n(B) = 26 and n(A ∩ B) = 12 then n(A ∪ B)′ = ?
Solution:
আমরা জানি,
n(A ∪ B)= n(A) + n(B) - (A ∩ B)
= 28 + 26 - 12
= 42
এখন,
n(A ∪ B)′= n(U) - n(A ∪ B)
= 50 - 42
= 8
সুতরাং, n(A ∪ B)′ = 8
0
Updated: 1 month ago
If A = {a, b, c, d, e, f, g} and B = {d, e, f, g}, then A - B = ?
Created: 3 weeks ago
A
{a, b, c}
B
{a, b, c, d}
C
{d, e, f}
D
{d, e, f, g}
Question: If A = {a, b, c, d, e, f, g} and B = {d, e, f, g}, then A - B = ?
Solution:
A - B = {a, b, c, d, e, f, g} - {d, e, f, g}
= {a, b, c}
0
Updated: 3 weeks ago
