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Find the values of k for which x²-kx+4=0

Posted by Deepika Chowdary 2 years, 9 months ago

CBSE > Class 10 > Mathematics

3 answers

Preeti Dabral 2 years, 9 months ago

To find the value of k

sol: A quadratic equation has equal real roots if the discriminant b²−4ac=0

x²−kx+4=0 is of form ax²+bx+c=0

∴a=1,b=−k,c=4

Hence the discriminant is

(−k)²−4(1)(4)=0⟹k²−16=0⟹k²=16

Therefore, k=±4

1Thank You

Nikita Yadav 2 years, 9 months ago

0Thank You

Jatin Bansal 2 years, 9 months ago

1Thank You

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