Monday, August 24, 2009
can anyone help me?
in the homework we had tonight, i thought i was doing them right until i got to 73-76. i worked a few and forgot to put everything over bottom squared while doing the product rule, and i don't know how to work it when i do that. for example in number 73i got x^2 - 2x all over (x - 1)^2. i factored an x out of the top and got x (x-2) all over (x-1)^2. How do i set all of that equal to zero and then solve to find the point(s) of the horizontal tangent line?
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You are doing it correctly. You DO set it equal to zero, but when you multiply the left and the right by the bottom of the left side (the x-1^2) it cancels out on the left and is simply 0 on the right.
ReplyDeleteBecause anything times 0 is just 0. Simply set the top = to 0 when dealing with quotient rule.
Don't get this confused with any other ones that don't have 0 on the right side.
I know this one....lol all you have to do multiply each side of the equation by the denominator at the bottom of the fraction, it cancels on the left and then your left with a simple algebriac equation to solve by setting it equal to zero
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