At which root does the graph of f(x) = (x + 4)Ⓡ(x + 7)5 cross the x-axis?
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x = -7

Step-by-step explanation:

Our function is . Notice that our possible roots are when x + 4 = 0 and when x + 7 = 0. So, our roots are -4 and -7.

However, the power above x + 4 is even, meaning the graph will simply touch the x-axis at x = -4, but not pass through. The power above x + 7, though, is odd, which means the graph will cross the x-axis.

Thus, the answer is x = -7.