যদি a + b + c = 12, a + b = 4 এবং a + c = 7 হয়, তাহলে a2 এর মান কত?
Solution
Correct Answer: Option B
দেয়া আছে,
a + b + c = 12.....(1)
a + b = 4.....(2)
a + c = 7....(3)
এখন
a + b + a + c = 4 + 7
2a + b + c = 11 .....(4)
(4)নং থেকে (1)নং বিয়োগ করে পাই,
2a + b + c - (a + b + c) = 11 - 12
» a = - 1
» a2 = (- 1)2
» a2 =1
a + b + c = 12.....(1)
a + b = 4.....(2)
a + c = 7....(3)
এখন
a + b + a + c = 4 + 7
2a + b + c = 11 .....(4)
(4)নং থেকে (1)নং বিয়োগ করে পাই,
2a + b + c - (a + b + c) = 11 - 12
» a = - 1
» a2 = (- 1)2
» a2 =1
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