Find the values of k for …
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Preeti Dabral 1 year, 10 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
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