Tuesday
March 31, 2015

Homework Help: other Quadratic equations

Posted by theresa on Saturday, January 27, 2007 at 8:16am.

The problem is 7x^3-x+1=x^3+3x^2+x. Find all real answers. I came upwith two answers 3x^2=1 and 2x=1/2. The first answer just does not look right. I must be forgeting something!

You can check them by putting in x=1/4 (the second answer), and then x=+- sqrt(1/3) These are three answers that need to be checked.

If the equation balances, the answers are correct.

The other way of checking it is to graph
y=7x^3-x+1-x^3-3x^2-x. yes, combine the terms. Where y is zero, ie, crossing the x axis, that is a real solution.

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

solving Equations - Solve x square pluse 5x subtracting by 6 equals zero? X^2 + ...
Please Check My Math Work - Hi. - I solved this problem,but I am not sure if it ...
QUADRATIC EQUATION - r^2+8r=48 First bring the 48 to the other side of the ...
Easy (yet confusing) Algebra - These problems are pretty easy, but confusing (as...
math, correction plz - Can someone correct these for me.PLZ Problem#1 Directions...
check math - Here are my answers. Can you check if I got the right answers? ...
Quadratic Equations - The question is Is the point (-3, -2) a solution of the ...
Math for Trish To Help Me With - Factor the following. You will earn 5 points ...
check math - Here are my answers. Can you check if I got the right answers? ...
check math - Here are my answers. Can you check if I got the right answers? ...

Members