Posted by Roy Jr on Wednesday, December 14, 2011 at 10:27pm.
(2x+3y+4z) to the 3rd power

math  MathMate, Wednesday, December 14, 2011 at 11:39pm
There is no easy rule, because there are many terms.
The following identity could help:
(a+b+c)^3
=c^3+3bc^2+3ac^2+3b^2c+6abc+3a^2c+b^3+3ab^2+3a^2b+a^3
So substitute 2x for a, 3y for b and 4z for c. Do not forget that a^2 would mean (2x)^2=4x^2, a^3 would mean (2x)^3=8a^3 and so on.
A good way to check your work is to add up the coefficients, they should equal (2+3+4)^3 = 729.

math  Reiny, Wednesday, December 14, 2011 at 11:39pm
very patiently expand
(2x + 3y + 4z)(2x + 3y + 4z)(2x + 3y + 4z)
= ....
Answer This Question
Related Questions
 math 115   (4)3rd power + (3)2nd power  .5 3rd power is 72.875 correct? The...
 Math/Standard and scientific notation  Express each measure in standard form. (...
 8th grade mathexponents  I can't quite write the problem, so I'll try to ...
 8th grade mathexponents  I can't quite write the problem, so I'll try to ...
 Algebra II  The problem states: Saturn is approximately 1.4x 10 to the 9th ...
 Intermediate Algebra  add or subtract the following polynomials as indicated (5...
 prealgebra  find the product: (4k to the 5th power)(2k)to the 3rd power. 5th ...
 Algebra  (11x to the 5th power +4x + 8x to the 3rd power)+(13x2+7x to the ...
 Algebra  (11x to the 5th power +4x + 8x to the 3rd power)+(13x2+7x to the ...
 math  what is (x to the 3rd power + x to the 2nd power) divided by ((x+4)(X4...
More Related Questions