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Question
a + b = 6, al - b = 4 হলে ab এর মান কত?
2
5
3
4
ANSWER : 2
Descrption
<p style="margin-left:0px;">Given the equations:</p><ol><li>a + b = 6</li><li>a - b = 4</li></ol><p style="margin-left:0px;">We can solve for a and b simultaneously. Let's add equation (1) and equation (2) to eliminate b:</p><p style="margin-left:0px;">(a + b) + (a - b) = 6 + 4</p><p style="margin-left:0px;">Simplify:</p><p style="margin-left:0px;">2a = 10</p><p style="margin-left:0px;">Now, divide both sides by 2 to find the value of a:</p><p style="margin-left:0px;">2a/2 = 10/2</p><p style="margin-left:0px;">a = 5</p><p style="margin-left:0px;">Now that we have the value of a, we can find b using equation (1):</p><p style="margin-left:0px;">a + b = 6</p><p style="margin-left:0px;">5 + b = 6</p><p style="margin-left:0px;">Subtract 5 from both sides to find b:</p><p style="margin-left:0px;">b = 6 - 5</p><p style="margin-left:0px;">b = 1</p><p style="margin-left:0px;">So, a = 5 and b = 1. To find the value of ab, simply multiply a and b:</p><p style="margin-left:0px;">ab = 5 * 1 = 5</p><p style="margin-left:0px;">Therefore, the value of ab is 5.</p>
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