Thursday
April 24, 2014

Homework Help: Algebra

Posted by Sandrine on Wednesday, September 16, 2009 at 7:44pm.

How come when you find the square of the binomial (2x-5y)^2, the answer is 4x^2-20xy+25y^2 (according to my book)? I would think that the middle term, 2(2x-5y) would be 4x-10y, but my book says it is -20xy. But I thought you 2x and 5y were separate terms so you can't combine them like that by multiplying them together to form -20xy. Please explain why this is. Thanks!

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

math - (6x-5y)^2= 36x-25y 6x-5y (4x+5y)^2 16x+25y 4x+5y Please check to see if ...
Algebra 2 - maximize p=6x+10y minimize p=14x+9y use elimination to solve: 4x+5y=...
Math - Another crazy one... 3sqrt5y^5 divided by 6sqrt20xy For this 3 square ...
Algebra - Checking a few answers to some algebra problems: 1.Find the slope of ...
math - Which equation shows the correct use of power of products property? a) (...
ALGEBRA - 1, Factor each expression x^2 - 10x - 24 A. (x + 4)(x - 6) B. (x + 6)(...
Algebra/Math - Could you please check these thanks for your time. Directions: ...
Algebra - 4x^4-18x^2=0. I have to find out what x equals by factoring. What I ...
Calculus - relative extrema x^4-2x^2+5 so far I know how to find the derivative ...
algebra - addition method:3x-5y=-2 and 5y-2x=-2 how would I solve it since they ...

Search
Members