CBSE Class 9 Answered
In a quadratic equation
xsquare +kx +1= 0 ,find range of k for which both roots are
A) positive
B) negative
C) one positive and one negative
Asked by tanishq gupta | 12 Aug, 2012, 07:33: PM
Expert Answer
Given quadratic equation is x2 + kx + 1 = 0
Sum of roots = -k
Product of roots = 1
A) When both roots are positive, the sum as well as the product is positive.
So, we have:
-k > 0, i.e., k < 0
B) When both roots are negative, the sum is negative but the product is positive.
So, we have:
-k < 0, i.e., k > 0
Note: For the third case, we would request you to cross- check and clarify the condition again as there seems some problem in that.
Answered by | 12 Aug, 2012, 09:52: PM
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