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OpenStudy (anonymous):
I have the equation "f(x)=2(x+3)(x^2-4+5)". I have to prove that 'f' only has one root or origin, not entirely sure what the terminology is in english, but basically that it only passes the x-axis once. I've come as far as figuring I should use the quadratic formula on (x^2-4+5), and got -4, but after that I'm not really sure where to go.
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