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CBSE Class 10 Answered

For what value of k the quadratic equation (k+4)x2 +(k+1)x+1=0 has equal roots
Asked by amiann202017 | 06 Mar, 2019, 11:21: AM
answered-by-expert Expert Answer
A quadratic equation, ax2 +bx+c =0, has equal roots when b2 = 4ac
 
hence (k+1)2 = 4(k+1)   or k2 -2k -15 = 0    or  (k-5)(k+3) = 0
 
hence when k=5 or k=-3 we get equal roots
Answered by Thiyagarajan K | 06 Mar, 2019, 11:40: AM

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