Study Barn - If 2z2 - 5z + 30 < 2z2 + 5z - 15, which of the following MUST be true?

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If 2z² - 5z + 30 < 2z² + 5z - 15, which of the following MUST be true?

A. z = 4.5

B. z < 4.5

C. z = 6

D. z > 4.5

E. z > 6

The given inequality can be simplified as follows.
2z² + 5z - 15 - 2z² + 5z - 30 > 0
10z - 45 > 0 or 10z > 45 or z > 4.5

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Taken: 20 times

Added: 11/11/2008

Liked: 1 time

Taggged: Math, SAT

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