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 is

Answer»

<P>`(3)/(20)`
`(13)/(20)`
`(7)/(20)`
`(1)/(2)`

SOLUTION :`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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