a+b=5 এবং a-b =3 হলে, ab এর মান কত?
Solution
Correct Answer: Option A
দেওয়া আছে,
a+b = 5......(i)
a-b = 3......(ii)
(i)+(ii) ⇒
2a = 8
⇒a = 4
(i)⇒
b = 5-4
=1
ab= 4.1 = 4
a+b = 5......(i)
a-b = 3......(ii)
(i)+(ii) ⇒
2a = 8
⇒a = 4
(i)⇒
b = 5-4
=1
ab= 4.1 = 4
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