You can put this solution on YOUR website! How do you write a function that has x-intercepts of -3 and 4 when graphed?
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The simplest is f(x) = (x+3)*(x-4)
Any number of multiplying factors can be added.
eg, f(x) = x*(x+3)*(x-4), f(x) = (x+k)*(x+3)*(x-4) where k is any constant.