How to complete the proof
1 answer:
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Answer:
(-5, 0) ∪ (5, ∞)
Step-by-step explanation:
I find a graph convenient for this purpose. (See below)
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When you want to find where a function is increasing or decreasing, you want to look at the sign of the derivative. Here, the derivative is ...
f'(x) = 4x^3 -100x = 4x(x^2 -25) = 4x(x +5)(x -5)
This has zeros at x=-5, x=0, and x=5. The sign of the derivative will be positive when 0 or 2 factors have negative signs. The signs change at the zeros. So, the intervals of f' having a positive sign are (-5, 0) and (5, ∞).
X + 4 = 12
This is because the question gives you everything you require for this sentence to be formed. 12 is the final answer. 4 is added on and
is basically the number that is to be found.
This is because the question gives you everything you require for this sentence to be formed. 12 is the final answer. 4 is added on and