solve the quadratic formula...stuck?
回答 (4)
2009-04-30 6:52 am
✔ 最佳答案
Why don't you look at my answer to the first question that you asked, then apply it to this one. See if you can't figure it out from there.
2009-04-30 1:56 pm
4x² + 12x + 6 = 0
x² + 3x = - 3/2
x² + 3/2x = - 3/2 + (3/2)²
x² + 3/2x = - 6/4 + 9/4
(x + 3/2)² = 3/4
x + 3/2 = 0.8660255
x = 0.8660255 - 1.5, x = - 0.6339745
x = - 0.8660255 - 1.5, x = - 2.3660255
Answer: x = - 0.6339745, - 2.3660255; Factors: 4(x + 0.6339745)(x + 0.23660255)
x² + 3x = - 3/2
x² + 3/2x = - 3/2 + (3/2)²
x² + 3/2x = - 6/4 + 9/4
(x + 3/2)² = 3/4
x + 3/2 = 0.8660255
x = 0.8660255 - 1.5, x = - 0.6339745
x = - 0.8660255 - 1.5, x = - 2.3660255
Answer: x = - 0.6339745, - 2.3660255; Factors: 4(x + 0.6339745)(x + 0.23660255)
2009-04-30 5:34 pm
4x^2 + 12x + 6 = 0
2x^2 + 6x + 3 = 0
x = [-b 屉(b^2 - 4ac)]/2a
a = 2
b = 6
c = 3
x = [-6 屉(36 - 24)]/4
x = [-6 屉12]/4
x = [-6 屉(2^2 * 3)]/4
x = [-6 ±2â3]/4
x = [-3 屉3]/2
â´ x = [-3 ±â3]/2
2x^2 + 6x + 3 = 0
x = [-b 屉(b^2 - 4ac)]/2a
a = 2
b = 6
c = 3
x = [-6 屉(36 - 24)]/4
x = [-6 屉12]/4
x = [-6 屉(2^2 * 3)]/4
x = [-6 ±2â3]/4
x = [-3 屉3]/2
â´ x = [-3 ±â3]/2
2009-04-30 2:47 pm
Use the quadratic formula to find the answer.
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https://hk.answers.yahoo.com/question/index?qid=20090429224742AAcsKle