Question 19
Quadratic EquationsFind the value of k for which the equation 2x2 − kx + 8 = 0 has equal roots.
- A.16
- B.±3
- C.±8
- D.±4
Show the answer and explanation
Answer: C (±8)
Explanation
k² − 4(2)(8) = 0 gives k² = 64, so k = ±8.
Find the value of k for which the equation 2x2 − kx + 8 = 0 has equal roots.
Answer: C (±8)
k² − 4(2)(8) = 0 gives k² = 64, so k = ±8.