Friday

November 28, 2014

November 28, 2014

Posted by **karen** on Saturday, October 27, 2012 at 3:37pm.

- math grade 12 -
**Steve**, Saturday, October 27, 2012 at 4:00pmjust plug the values into the equation

100 = x(20-2x)(30-2x)

4x^3 - 100x^2 + 600x - 100 = 0

x^3 - 25x^2 + 150x - 25 = 0

There are 3 real solutions, approximately

0.17, 9.52, 15.31

15.31 is out, since the sides aren't long enough.

Not an easy problem, if you have no tools for solving cubics.

**Answer this Question**

**Related Questions**

Math - An open-topped box can be created by cutting congruent squares from each ...

math - An open topped box can be created by cutting congruent squares from each ...

math - An open-topped box is made from a rectangular piece of cardboard, with ...

algebra 2 - you can make an open box from a piece of flat cardboard. First cut ...

math - you want to make an open-topped box from a 20 cm by 20 cm piece of ...

math - An open box is made from a rectangular piece of cardboard, with ...

Calculus - an open box is made by cutting out squares from the corners of a ...

calculus - An open box is to be made out of a 8-inch by 14-inch piece of ...

AFM (MATH) - a) Write an equation to represent the volume of an open box ...

calculus - You are planning to make an open-top box from an 12 in by 12 in piece...