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3 years ago

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Over what interval is the graph of f(x) = –(x + 8)2 – 1 decreasiang help

1 answer:

Degger [83]3 years ago

5 0

Please use " ^ " to denote exponentiation:

<span>f(x) = –(x + 8)^2 – 1
Find the first derivative: f '(x) = -2(x+8)(1)
Set this = to 0: -2(x+8) = 0
solve for x: x = -8
Divide the number line into subintervals based upon x=-8:

(-inf, -8) and (-8, inf)

Choose a test value for x from each interval, e. g., -10 from the first interval and 20 from the second.

Subst. this test value into the derivative, shown above.

If the result is + the function is incr on that interval; if - the fn. is decr.

Questions welcome!</span>

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<u />

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