book Maths Puzzle Numerical Ability

Solve.

m�+ 2m� - 3m = 0

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give an example of a function that has many values in the domain and only one element in the range. I need help calculating the area between the y-axis and y = x squared, from y = 4 and y = 9. I beleive my graph would show a parabola, however I am not sure. Would you please hel