Homework Help: algebra

Posted by Anissa on Monday, October 10, 2011 at 1:47pm.

Find the max or min value for y given the restictions on x.
y= x^3 -x^2 -6x

a) 0<x<3 min

b) -2<x<0 max

algebra - Anonymous, Monday, October 10, 2011 at 2:55pm
tttt
algebra - Anissa, Monday, October 10, 2011 at 3:00pm
what is tttt?
algebra - Steve, Monday, October 10, 2011 at 3:13pm
y = x^3 - x^2 - 6x = 0(x+2)(x-3)
y' = 3x^2 - 2x - 6

y' = 0 at approximately 1.7, -1.1 (1 +- sqrt(19))/3.

Knowing what we do about the shape of cubics, we can say that a local max is at x=-1.1, and a local min is at x=1.7

Note how the given intervals correspond to exactly one "hump" of the graph, so the local min/max is the min/max for that interval.
algebra - Anissa, Monday, October 10, 2011 at 3:45pm
I don't understand the y' stuff. I'm only in algebra. Is there another way?
algebra 1 - toria, Monday, October 10, 2011 at 5:09pm
how do u convert 63 yards into ft

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