Question

For what value of k the quadratic equation 2x2 + kx +5 =0 has equal roots (a) ±2√10 (b) ±4√10 (c) ±√20 (d) ±10√2

Answer 1

Answer:. Thanku

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Answer 2

Given ; 2x2 + kx +5 =0 has equal roots

To Find; the value of k

Solution; It is given that the quadratic equation 2x2 + kx +5 =0 has equal roots.

So for equal roots discriminant =0

comparing it with standard equation ax² + bx + c

a=2 b = k c= 5

D=0

b^2-4ac=0

k^2 -40=0

Hence k =√40