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4m^2 - 12m > 0,

4m(m-3) > 0

But I don't understand why m<0?

Thanks!

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1 Answer

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the answer would be m3 right?
The way how i approach these questions is to draw the graph 4m^2 - 12m which is 4m(m-3). From this graph, look at when the graph is above the y-axis, ie. zero
Try substituting negative numbers into the equation and you would realise that the answer is still greater than zero therefore valid. This clearly proves the answer m

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