1.

If a and b are the maximum and minimum values of the quadraticexpressions 1-2x - 5x^(2) and x^(2) - 2x + 5 respectively, then the set of all values of x for which the expression 5 ax^(2) + bx + 7 is positive, is

Answer»

(a, B)
`(-OO, 7)`
`(5, oo)`
`(-oo, oo)`

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