The exponent should be considered first. So what you really have is y = -(m²)
So because m² cannot be negative, then, except in one case, y is negative. The one exception is the case in which m = 0.
If m = 0 then y = 0
I - Not true if m = 0.
II - Not necessarily the case. Any value of m will work.
III - If m is not 0, then y is negative. So this must be true.
The correct answer is C.
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y = m squared
Source: Beat The GMAT — Problem Solving |
Marty Murray
Perfect Scoring Tutor With Over a Decade of Experience
MartyMurrayCoaching.com
Contact me at [email protected] for a free consultation.
Perfect Scoring Tutor With Over a Decade of Experience
MartyMurrayCoaching.com
Contact me at [email protected] for a free consultation.












