How do you factor the trinomial 3x^2+18x-21?
1 answer:
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Answer:
x = 1
Step-by-step explanation:
The graph shows the curves cross at x=1.
The solution is x = 1.
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<em>Additional comment</em>
I personally find it more convenient to look for the zeros (x-intercepts) of the difference f(x)-g(x). That way, I'm only graphing one function, and I don't have to look all over the graph to try to find the point of intersection. (The solution is always on the x-axis.) The attached graph shows f(x) - g(x) as a dashed green line.
