1.

If `a in [-20,0]`, then the probability that the graph of the function `y=16x^(2)+8(a+5)x-7a-5` touches or above the x-aixs isA. `(3)/(20)`B. `(13)/(20)`C. `(7)/(20)`D. `(1)/(2)`

Answer» Correct Answer - B
`a in [-20,0]`
`because` Graph of the function `y=16x^(2)+8(a+5)x-7a-5` touches or above the x-axis
`implies Dle0implies 64(a+5)^(2)+64(7a+5)le0impliesa^(2)+17a+30le0impliesa in [-10,-3]" "therefore "Probability" P(7)/(20)`


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