1.

`(x-2)(x-9)` का न्‍यूनतम मान क्‍या है?A. `-11/4`B. `49/4`C. `0`D. `-49/4`

Answer» Correct Answer - D
`(x-2)(x-9)`
`=x^(2)-9x-2x+8`
`=x^(2)-11x+18`
`=ax^(2)+bx+c=0`
For minimum value
`(4ac-b^(2))/(4a)`
`=(4xx1xx18-(-11)^(2))/(4xx1)=(72-121)/4=(-49)/4`


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