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Let A denotes the set of values of x for which `(x+2)/(x-4) le0` and B denotes the set of values of x for which `x^2-ax-4 le 0`. If B is the subset of A then a cannot take integral value (a) 0, (b) 1 (c) 2 (d) 3 |
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Answer» `(x+2)/(x-4)<=0` `x in [-2,4)` `A in [-2,4)` `x^2-4<=0` `f(-2)*f(4)>=0` `(4+2a-4)(16-4a-4)>=0` `2a(12-4a)>=0` `(4a-12)(2a)<=0` `a in[0,3)`. |
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