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X =3 is one root of …

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X =3 is one root of quadratic x² -2kn-6=0 find the value of k

Posted by Rohan Kumar 7 years, 2 months ago

CBSE > Class 10 > Mathematics

3 answers

Harsh Jain 7 years, 2 months ago

x2-2kn-6=0 (3)2-2k(3)-6=0 9-6k-6=0 3-6k=0 -6k=3 K=-3/6=-1/2

Yogita Ingle 7 years, 2 months ago

x² - 2kx - 6 = 0
(3)² - 2k(3) - 6 = 0
9 - 6k - 6 = 0
-6k - 3 = 0
- 6k = 3
k = 3/-6
k = -1/2

Vivek Vivek 7 years, 2 months ago

Put x=3 and solve

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