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If m > 0 and 3m2 + 12m – 15 = 0, then m =

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CEO
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Joined: 07 Jun 2014
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If m > 0 and 3m2 + 12m – 15 = 0, then m = [#permalink] New post 08 Apr 2018, 10:24
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Question Stats:

99% (00:24) correct 0% (00:00) wrong based on 7 sessions
If m > 0 and 3m^2 + 12m - 15 = 0, then m =

Drill 1
Question: 7
Page: 508


[Reveal] Spoiler: OA
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Re: If m > 0 and 3m2 + 12m – 15 = 0, then m = [#permalink] New post 09 Apr 2018, 21:06
3m2+12m-15=0
m2+4m-5=0
(m+5)(m-1)=0
m=-5,1
since m>0, m=1 ANS.
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Re: If m > 0 and 3m2 + 12m – 15 = 0, then m = [#permalink] New post 10 Apr 2018, 02:24
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Factorization will give 2 possible values for m.

But as the question asks for only positive value, there is only one possible solution.

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CEO
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Joined: 07 Jun 2014
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Re: If m > 0 and 3m2 + 12m – 15 = 0, then m = [#permalink] New post 15 Apr 2018, 05:32
Expert's post
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.
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Re: If m > 0 and 3m2 + 12m – 15 = 0, then m =   [#permalink] 15 Apr 2018, 05:32
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If m > 0 and 3m2 + 12m – 15 = 0, then m =

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