#Using calculus, work out the maximum value of A as x varies.

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white tuskBOT
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slate valve
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can sm1 help me with (c) i did a and b

lime whale
slate valve
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how do i maximise stuff

lime whale
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dA/dx=0

slate valve
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ohh ok

lime whale
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then check if those values are maximums...

slate valve
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i got 0=1344-480x

lime whale
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(it is, it's a concave down parabola)

slate valve
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does maximum mean that dy/dx will be negative

lime whale
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maxima (at differentiable points) are turning points

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hence have derivative 0

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almost like why we set the derivative to be 0..

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but anyway, you can easily find where the maximum occurs (and verify it is a maximum by 1st/2nd derivative test), then just determine the maximum area

slate valve
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i didtn learn how to do dat yet

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i only know how to do the first part where u make it 0

lime whale
slate valve
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whats grade 9

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im not american

lime whale
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whenever you learned about functions

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and algebra

slate valve
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i can do dat

lime whale
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so then... you can do the rest of the question

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since the rest is just algebra... and evaluating a function

slate valve
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ok