For the quadratic equation x^2+2(a+1)x+9...

For the quadratic equation `x^2+2(a+1)x+9a-5=0,` which of the following is/are true? (a) If 2 < a< 5 then roots are opposite sign `
` (b)If `a<0` , then roots are opposite in sign (c) if `a>7` then both roots are negative (d) if `2<=a<=5` then roots are unreal

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