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Question
a + b =9 , a-b=7 হলে ab = কত?
7
6
9
8
ANSWER : 4
Descrption
<p>দেওয়া আছে, a + b = 9 এবং a - b = 7</p> <p>∴ab = {(a + b)<sup>2</sup> - (a - b)<sup>2</sup>}/4</p> <p> = (9<sup>2</sup> - 7<sup>2</sup>)/4</p> <p> = (81 - 49)/4</p> <p> = 32/4</p> <p> = 8</p>
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