Retired Moderator
Joined: 07 Jun 2014
Posts: 4815
Given Kudos: 0
WE:Business Development (Energy and Utilities)
Re: If m > 0 and 3m2 + 12m – 15 = 0, then m =
[#permalink]
15 Apr 2018, 05:32
Explanation
Factor the quadratic equation: \((3m - 3)(m + 5) = 0\).
Only the first factor gives a positive result: If \(3m - 3 = 0\), then \(m = 1\).
Alternately, you may notice that the equation is true if you ignore the variables, and making m = 1 would allow you to disregard them.