Homework Help: Algebra

Posted by Rachal on Friday, February 4, 2011 at 6:38pm.

A 3 inch thick slice is cut off the top of a cube, resulting in a rectangular box that has volume 128in^3 .Round your answer to two decimal places

Algebra - helper, Friday, February 4, 2011 at 6:50pm
What is the question?
Algebra - Damon, Friday, February 4, 2011 at 6:51pm
x*x*(x-3) = 128
x^3 - 3 x^2 = 128

x^3 - 3 x^2 - 128 = 0
try x = 6
216 - 108 - 128 = -20
try x = 6.5
19.875
hmm try 6.25
-1.05
so try 6.20
-4.99
try 6.3
2.98
try 6.26
-.248
try 6.27
.553
so x = about 6.26

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