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Question
যদি
a
2
+
1
a
2
=
51
হয় তবে
a
-
1
a
এর মান কত?
±
9
±
7
±
5
±
3
ANSWER : 2
Descrption
এখানে, <math xmlns = "http://www.w3.org/1998/Math/MathML"><msup><mi>a</mi><mn>2</mn></msup><mo> + </mo><mfrac><mn>1</mn><msup><mi>a</mi><mn>2</mn></msup></mfrac><mo> = </mo><mn>51</mn><mspace linebreak = "newline"/><mo>⇒</mo><mo>(</mo><mi>a</mi><mo> - </mo><mfrac><mn>1</mn><mi>a</mi></mfrac><msup><mo>)</mo><mn>2</mn></msup><mo> + </mo><mn>2</mn><mo>.</mo><mi>a</mi><mo>.</mo><mfrac><mn>1</mn><mi>a</mi></mfrac><mo> = </mo><mn>51</mn><mspace linebreak = "newline"/><mo>⇒</mo><mo>(</mo><mi>a</mi><mo> - </mo><mfrac><mn>1</mn><mi>a</mi></mfrac><msup><mo>)</mo><mn>2</mn></msup><mo> = </mo><mn>51</mn><mo> - </mo><mn>2</mn><mspace linebreak = "newline"/><mo>⇒</mo><mo>(</mo><mi>a</mi><mo> - </mo><mfrac><mn>1</mn><mi>a</mi></mfrac><msup><mo>)</mo><mn>2</mn></msup><mo> = </mo><mn>49</mn><mspace linebreak = "newline"/><mo>⇒</mo><mi>a</mi><mo> - </mo><mfrac><mn>1</mn><mi>a</mi></mfrac><mo> = </mo><mo>±</mo><mn>7</mn></math>
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