Find the zeros of the quadratic polynomial √3x² − 8x + 4√3.
2019
Find the zeros of the quadratic polynomial √3x² − 8x + 4√3.
- A.
−2√3, 2/√3
- B.
−2√3, −2/√3
- C.
2√3, 2/√3
- D.
2√3, −2/√3
Attempted by 38 students.
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Correct answer: C
Solve √3 x² − 8x + 4√3 = 0 using the quadratic formula with a = √3, b = −8, c = 4√3.
Compute the discriminant: Δ = b² − 4ac = (−8)² − 4(√3)(4√3) = 64 − 48 = 16, so √Δ = 4.
Apply the quadratic formula: x = [−b ± √Δ]/(2a) = [8 ± 4]/(2√3).
Calculate the two roots: (8 + 4)/(2√3) = 12/(2√3) = 6/√3 = 2√3, and (8 − 4)/(2√3) = 4/(2√3) = 2/√3.
Zeros: 2√3 and 2/√3
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