# Algebra

Quick Question, when would an inequality like this work: x^2 - 4x >or equal to 0?
...What would I have to do to figure out when this would and would not work?

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1. If you plot the graph, it will be a parabola concave up, with a zero at x=0, or x=4.
Therefore f(x)≤0 when x∈[0,4).
S={x|x∈(-∞,0]∪[4,+∞)}

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