1.

If `y=log_(7-a)(2x^(2)+2x+a3)"is defined"AAx inR,` then possible integral value (s) of a is/areA. `-3`B. `-2`C. 4D. 5

Answer» For `log_(7-a)(2x^(2)+2x+a+3)`
`{:(2x^(2)+2x+a+3gt0, and, 7-agt0","7-a ne1),(thereforeDlt0,,),(implies4-4(2)(a+3)lt0,and,alt7","a ne8):}`
`implies1-2(a+3)lt0`
`implies2(a+3)gt1`
`impliesa+3gt1/2`
`impliesa gt-5/2`
`therefore-5/2ltalt7" ""]"`


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