1.

यदि `x^(4)+2x^(3)+ax^(2)+bx+9` एक सम्पूर्ण वर्ग है जहां `a` और `b` का मान क्या होगा?A. `a=5,b=6`B. `a=6,b=7`C. `a=7,b=7`D. `a=7,b=8`

Answer» Correct Answer - B
`x^(4)+2x^(3)+ax^(2)+bx+9`
put `x=1`
`=1+2xx1+a+b+9`
`=1+2+a+b+9`
`12+a+b`
To make perfect square no. value of `a+b` must be either 4 or 13.
Now option (b) `a=6, b=7, a+b=13`.
makes perfect square `(25=5^(2))`


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