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Question
a এর মান কত হলে
9
-
12
x
+
a
x
2
একটি পূর্ণবর্গ রামি হবে?
8
6
1
4
ANSWER : 4
Descrption
<pre> <math xmlns = "http://www.w3.org/1998/Math/MathML"><mn>9</mn><mo> - </mo><mn>12</mn><mi>x</mi><mo> </mo><mo> + </mo><mi>a</mi><msup><mi>x</mi><mn>2</mn></msup><mspace linebreak = "newline"/><mo> = </mo><msup><mn>3</mn><mn>2</mn></msup><mo> - </mo><mn>2</mn><mo>.</mo><mn>3</mn><mo>.</mo><mn>2</mn><mi>x</mi><mo> + </mo><mi>a</mi><msup><mi>x</mi><mn>2</mn></msup></math> রাশিমালা হতে স্পষ্ট <math xmlns = "http://www.w3.org/1998/Math/MathML"><mi>a</mi><msup><mi>x</mi><mn>2</mn></msup><mo> = </mo><mo>(</mo><mn>2</mn><mi>x</mi><msup><mo>)</mo><mn>2</mn></msup></math> হলে রাশিটি পূর্ণবর্গ হবে। <math xmlns = "http://www.w3.org/1998/Math/MathML"><mo>⇒</mo><mi>a</mi><msup><mi>x</mi><mn>2</mn></msup><mo> = </mo><mn>4</mn><msup><mi>x</mi><mn>2</mn></msup></math> " " " " ∴ a = 4 " " " " </pre>
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