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If 2 is a root of the equation x2+kx+12= 0 and the equation x2+kx+ q=0 has equal roots .find the value of q.

Posted by Prachi K 6 years, 11 months ago

CBSE > Class 10 > Mathematics

3 answers

Rishabh Jain 6 years, 11 months ago

Sorry my mistake krithika is right the answer is 16

1Thank You

Krithika .L 6 years, 11 months ago

X2 + kx +12=0. 2 is a root of the equation. Then, 4+2k+12=0. Then, 2k+16=0. So, 2k= -16. Therefore, k= -8. x2+kx+q=0. x2-8k+q=0. Equal roots, so b2 =4ac. 64=4*1*q q=16.

2Thank You

Rishabh Jain 6 years, 11 months ago

q = 4

1Thank You

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