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Question

$a^{2} = 25, b^{2} = 49$ হলে ab এর মান কত?

0.16

35

1.06

0.016

ANSWER : 2

Descrption

<pre>

<math xmlns = "http://www.w3.org/1998/Math/MathML"><msup><mi>a</mi><mn>2</mn></msup><mo> = </mo><mn>25</mn><mspace linebreak = "newline"/><mo> = </mo><mo>(</mo><mo>&#xB1;</mo><mn>5</mn><msup><mo>)</mo><mn>2</mn></msup><mspace linebreak = "newline"/><mo>.</mo><mo>'</mo><mo>.</mo><mi>a</mi><mo> = </mo><mo>&#xB1;</mo><mn>5</mn><mspace linebreak = "newline"/><msup><mi>b</mi><mn>2</mn></msup><mo> = </mo><mn>49</mn><mspace linebreak = "newline"/><mo> = </mo><mo>(</mo><mo>&#xB1;</mo><mn>7</mn><msup><mo>)</mo><mn>2</mn></msup><mspace linebreak = "newline"/><mo>.</mo><mo>'</mo><mo>.</mo><mi>b</mi><mo> = </mo><mo>&#xB1;</mo><mn>7</mn><mspace linebreak = "newline"/><mo>.</mo><mo>'</mo><mo>.</mo><mo>&#xA0;</mo><mi>a</mi><mi>b</mi><mo> = </mo><mn>5</mn><mo>&#xD7;</mo><mn>7</mn><mspace linebreak = "newline"/><mo> = </mo><mn>35</mn><mspace linebreak = "newline"/><mi>a</mi><mi>b</mi><mo> = </mo><mo>(</mo><mo> - </mo><mn>5</mn><mo>)</mo><mo>&#xA0;</mo><mo>&#xD7;</mo><mo>(</mo><mo> - </mo><mn>7</mn><mo>)</mo><mspace linebreak = "newline"/><mo> = </mo><mn>35</mn></math>
</pre>

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