2. 外语
  3. Solve each of the following equations for x. (a)5x-7 = 28 (b)12-5x = x + 30 (c)5(x + 2)= l-3x (d)(x + 6)(2x-l)= 0 (e)x2+5x-14 =

Solve each of the following equations for x. (a)5x-7 = 28 (b)12-5x = x + 30 (c)5(x + 2)= l-3x (d)(x + 6)(2x-l)= 0 (e)x2+5x-14 =

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问题 Solve each of the following equations for x.
(a)5x-7 = 28
(b)12-5x = x + 30
(c)5(x + 2)= l-3x
(d)(x + 6)(2x-l)= 0
(e)x2+5x-14 = 0
(f)x2-x-l = 0
选项
答案(a)7 (b)-3 (c)[*] (d)-6, 1/2 (e)-7, 2 (f)[*]
解析
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