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যদি a+b=2, ab=1 হয় তবে a এবং b এর মান যথাক্রমে -----

0, 2

1, 1

-1, 3

-3, -4

ANSWER : 2

Descrption

আমরা জানি <math xmlns = "http://www.w3.org/1998/Math/MathML"><mo>(</mo><mi>a</mi><mo> - </mo><mi>b</mi><msup><mo>)</mo><mn>2</mn></msup><mo> = </mo><mo>(</mo><mi>a</mi><mo>  +  </mo><mi>b</mi><msup><mo>)</mo><mn>2</mn></msup><mo> </mo><mo> - </mo><mn>4</mn><mi>a</mi><mi>b</mi><mspace linebreak = "newline"/><mo>⇒</mo><mo>(</mo><mi>a</mi><mo> - </mo><mi>b</mi><msup><mo>)</mo><mn>2</mn></msup><mo> = </mo><mn>4</mn><mo> - </mo><mn>4</mn><mspace linebreak = "newline"/><mi>a</mi><mi>b</mi><mo> = </mo><mn>1</mn><mo> </mo><mo>.</mo><mo>.</mo><mo>.</mo><mo>.</mo><mo>.</mo><mo>(</mo><mn>2</mn><mo>)</mo><mo> </mo><mspace linebreak = "newline"/><mo>.</mo><mo>'</mo><mo>.</mo><mo> </mo><mi>a</mi><mo> - </mo><mi>b</mi><mo> = </mo><mn>0</mn><mo> </mo><mo>.</mo><mo>.</mo><mo>.</mo><mo>.</mo><mo>.</mo><mo>.</mo><mo>.</mo><mo>(</mo><mn>3</mn><mo>)</mo><mo> </mo><mspace linebreak = "newline"/><mo>(</mo><mn>1</mn><mo>)</mo><mo> </mo><mo>  +  </mo><mo>(</mo><mn>3</mn><mo>)</mo><mo> </mo><mo> </mo><mi>ক</mi><mi>র</mi><mi>ে</mi><mo> </mo><mi>প</mi><mi>া</mi><mi>ই</mi><mo> </mo><mo>,</mo><mo> </mo><mn>2</mn><mi>a</mi><mo> </mo><mo> = </mo><mn>2</mn><mo>,</mo><mo> </mo><mo>⇒</mo><mi>a</mi><mo> = </mo><mn>1</mn><mspace linebreak = "newline"/><mo>(</mo><mn>1</mn><mo>)</mo><mo> </mo><mo> - </mo><mo>(</mo><mn>3</mn><mo>)</mo><mo> </mo><mo> </mo><mi>ক</mi><mi>র</mi><mi>ে</mi><mo> </mo><mi>প</mi><mi>া</mi><mi>ই</mi><mo> </mo><mo>,</mo><mo> </mo><mn>2</mn><mi>b</mi><mo> </mo><mo> = </mo><mn>2</mn><mo>,</mo><mo> </mo><mo>⇒</mo><mi>b</mi><mo> = </mo><mn>1</mn><mspace linebreak = "newline"/></math>

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