Question

If one root of 2x²+ kx + 1 = 0 is -1/2 then the value of ‘k’ is a)3 b)-3 c)5 d)-5 Please answer.....

Answer 1

Answer:

c)5

Step-by-step explanation:

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Answer 2

Answer:

Assuming given quadratic equation 2x2 + kx +8 = 0 has real and equal roots If the quadratic equation is of the form ax2 + bx + c has equal roots then its discriminant is equal to zero. ⇒ Discriminant = b2 – 4ac = 0 ⇒ k2 - 4 × 2 × 8 = 0 ⇒ k2 - 64 = 0 ⇒ k2 = 64 ⇒ k = √64 ∴ k = ± 8.