ritula wrote:

Is k^2 + k - 2 > 0

1. k < 1

2. k > -1

In solving above question, i followed the following approach:

k^2 + k - 2=(k-1)(k+2)

In order to above equation to be greater than 0, k should lie between -2 and 1

i.e. -2<k<1. Now

(1) says k<1 but nothing abt -2. SO Insufficient

(2) k>-1 so must be greater than -2 as well but says nothing abt 1. so Insufficient

Combining 1 and 2, we get the answer. So C

Is my approach correct? is there any other way of soving such type of problems?

k should be (-∞,-2)&(1,+∞) but your answer is correct

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