a=12হলে, 2a+14a2-2a+1 এর মান নিচের কোনটি
A
1
B
2
C
3
Correct Answer: 2
হলে,<math xmlns = "http://www.w3.org/1998/Math/MathML"><mfenced><mrow><mn>2</mn><mi>a</mi><mo> </mo><mo> + </mo><mo> </mo><mn>1</mn></mrow></mfenced><mo> </mo><mfenced><mrow><mn>4</mn><msup><mi>a</mi><mn>2</mn></msup><mo> </mo><mo> - </mo><mo> </mo><mn>2</mn><mi>a</mi><mo> </mo><mo> + </mo><mo> </mo><mn>1</mn></mrow></mfenced><mspace linebreak = "newline"/><mo> = </mo><mfenced><mrow><mn>2</mn><mo>.</mo><mfrac><mn>1</mn><mn>2</mn></mfrac><mo> </mo><mo> + </mo><mo> </mo><mn>1</mn></mrow></mfenced><mo> </mo><mfenced><mrow><mn>4</mn><mo>.</mo><mfrac><mn>1</mn><mn>4</mn></mfrac><mo> </mo><mo> - </mo><mn>2</mn><mo>.</mo><mfrac><mn>1</mn><mn>2</mn></mfrac><mo> </mo><mo> + </mo><mn>1</mn></mrow></mfenced><mo> </mo><mo> = </mo><mo> </mo><mn>2</mn><mo> </mo><mo>×</mo><mo> </mo><mn>1</mn><mo> </mo><mo> = </mo><mo> </mo><mn>2</mn></math>