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# Help

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For which intervals is the function decreasing?

(2, ∞)

(1, 2)

(−∞, 0)

(0, 1)

Feb 26, 2019

#1
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It is decreasing when the gradient of the tangent to the curve is negative.

You can work out where this is true.

If you want we can chack the answer that you get.

THIS SHOULD BE A TEACHING FORUM - NOT A CHEAT FORUM!

JJ   I am not saying you are cheating. My comment is a general one.

Feb 26, 2019
edited by Melody  Feb 26, 2019
#2
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JJ probably doesn't know what a gradient is...

We read a function from left to right

Note that the function increases from (-inf, 0)   as we go from left to right

Then from  (0, 1)  it   does what ???

Then from (1, 2) it increases again

Then from (2, inf) it does what???

You should get two answers....see if you can get them based on the info given....

If not....let us know....

Feb 26, 2019
#3
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I think jj would know what a gradient is, otherwise this question would be way over his head (and you would not try to teach Calculus to a 5 year old would you?)

However, he may not know what a tangent is.  :)

Melody  Feb 26, 2019