Michigan State University - Diagnostic Exam

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4.12

  •   2 x+ 10x + 4 + b is a perfect square. Find b.

    a) 0 b) -4 c)  2 - x - 10x - 3 d) 21 e) 6

Solution:

( )2 10- ⇒4+b = 2 = 25 ⇒ b = 21

Diagnostic:

See 1.18: Expanding Binomials .

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July 15, 2008