lucajava wrote:
Given: \(ab ≠ 0\).
Statement 1: \(b = a^4 - a^3\), hence the question can be rewritten as: is \(a^5 - a^4 > 0\)? We cannot know it, since \(a^5\) could be either positive or negative. Insufficient.
Statement 2: it tells us that \(a\) is positive, but we don't know anything about \(b\). Insufficient.
Statements 1 + 2: \(a^5 - a^4 >0\)? Yes, because \(a\) is positive and \(a\) to the fifth power is greater than \(a\) to the fourth power.
Pick C.
A being positive still does not tell us anything about b? so i don't think C would be the answer. please help clarify
"Nevermind, got it. B = a^4 - a^ 3 gives it away