Homework Help: Math

Posted by Donna on Wednesday, August 31, 2011 at 10:02pm.

How do I write a polynomial expression to represent the third side of the triangle? I know one side is 2x-3y and the other is x+2y and P=5x+2y? I am lost.

Math - Reiny, Wednesday, August 31, 2011 at 11:12pm
I will assume that P represents the perimeter.

Let the third side be S

S + 2x-3y + x+2y = 5x + 2y
S = 5x+2y - 2x + 3y - x - 2y
= 2x + 3y

check:
What is the sum of (x+2y) + (2x-3y) + (2x+3y) ??

Answer this Question

Related Questions

math - the sum of the lenths of any two sides of a triangle must be greater than...
IRSC - the sum of the lengths of any two sides of a triangle must be greater ...
calculus - The base of a triangle is on the x-axis, one side lies along the line...
Math - One side of the triangle is 2cm longer than the second side. The third ...
7th grade math - Write and simplify an expression for the perimeter of the ...
Geomentry - What is the converse of the theorem statement: If a line parallel to...
word problems in algebra - A square has sides of length 3x - 2 cm. Express the ...
algebra - the perimeter of a triangle is 205. one side is 10 longer than the ...
math - one side of a right triangle has 2cm less than the hypothuse, and 7cm ...
7th grade - Write and simplify an expression for the perimeter of the triangle. ...

For Further Reading

First Name:
School Subject:
Answer: