Question

4x平方减6x减3=0？

运用公式法

Answer 1

4x²-6x-3=0

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△=36+4*4*3=84

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x=（6±2√21）/8=0.75±0.25√21

Answer 2

4x^2-6x-3=0

2(x^2-3x + 9/4) = 3 + 9/2

2(x-3/2)^2 = 15/2

(x-3/2)^2 = 15/4

x- 3/2 =√15/2 or  -√15/2

x =(3+√15)/2 or  (3-√15)/2