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# first and second derivative watch

1. Can anyone provide me "steps" as to how this is to be worked out? Thanks

f(x) = (1-q1-q2)*q1-c*q1

The first derivative, with respect to q1 of this function is:

1-2q1-q2-c

And the second is -2

The stationary point is at q1 = 1-q2-c/2
2. (Original post by oj234)
Can anyone provide me "steps" as to how this is to be worked out? Thanks

f(x) = (1-q1-q2)*q1-c*q1

The first derivative, with respect to q1 of this function is:

1-2q1-q2-c

And the second is -2

The stationary point is at q1 = 1-q2-c/2
The easiest way to see this is to expand the bracket then differentiate with respect to q1 in the normal manner.
3. (Original post by joostan)
The easiest way to see this is to expand the bracket then differentiate with respect to q1 in the normal manner.
got it
4. (Original post by oj234)
how do i expand this?
You know how to expand brackets, right?

Also, it's and not

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