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Value of A

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Junior | Next Rank: 30 Posts
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Joined: Fri Apr 20, 2007 1:18 pm

Value of A

by recocollins » Tue Jul 31, 2007 3:37 pm
What is the simpliest way to solve this equation:

If a NOT = 3 and (a^4 - 3a^3 - a + 3) / a-3 = -126

A. -5
B. 5
C. cubrt 126
D. sqrt 126
E. 25
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Junior | Next Rank: 30 Posts
Posts: 26
Joined: Thu Jul 05, 2007 12:53 pm
Location: Nashville

by lanter1 » Tue Jul 31, 2007 3:52 pm
a^4 - 3a^3 - a + 3=(a^3-1)(a-3)

(a^3-1)(a-3)/(a-3)=-126

(a^3-1)=-126

a^3=-125

a=-5
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