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If `A={x in R//x^(2)+5|x|+6=0}` then n(A)= . . .A. 2B. 0C. 1D. 4 |
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Answer» Correct Answer - D We have, `x^(2)-5absx+6=0` `!x^(2)-3absx-2absx+6=0` `!absx(absx-3)-2(absx-3)=0` `!(absx-2)(absx-3)=0` `!absx-2=0` or `absx-3=0` `!x=-2,2` or `x=-3,3` `therefore` n(A)=4 |
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