Michigan State University - Diagnostic Exam

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2.2

  •   If 2 x - 4x = - 1 , then x = (?).

     

    a)  √ -- 2 + 3 b)  √ -- 2 ± 3 c) √ -- 5 or 1 d) 2 e)  √ -- ± 3



Solution:
2 ⇒ x - 4x + 4 = - 1 + 4 ⇒ (x - 2)2 = 3 √ -- ⇒ x = 2 ± 3

Diagnostic:

If you miss this question please review completing the square.

See 2.1: Equations (Quadratic) .

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July 15, 2008