Homework Help: PLEASE HELP ME MATH

Posted by barb on Friday, November 12, 2010 at 11:57pm.

I only have 1 hour to get this question answered. Thank you in advance. I need a quadratic equation in the variable x given the solutions:
-7 sqrt 7, and 7 sqrt 7
This needs to be in the standard form of ax^2+bx+c=0.
Can someone please help me with this???? I am so lost!!!!

PLEASE HELP ME MATH - MathMate, Saturday, November 13, 2010 at 12:48am
For a quadratic equation with given zeroes z1 and z2, the equation is:
(x-z1)(x-z2)=0
In the given case, z1=-7√7 and z2=7√7.
Expand and simplify the resulting expression on the left-hand-side, and equate coefficients of powers x², x and constant term to get the values of a, b and c.

I gave you response to a similar question, except that I forgot the variable x, which should have read:
x² -5√5x -30 = 0

see:

http://www.jiskha.com/display.cgi?id=1289541351
PLEASE HELP ME MATH - barb, Saturday, November 13, 2010 at 1:00am
I understand, although mathlab checked it wrong and gave me this problem. I SIMPOLY do not understand this when it comes to radicals. And furthermore mathlab has a habit of checking problems wrong when they are indeed right.I understand how to FOIL, I just do not know how to work the radicals, CAN YOU PLEASE HELP ME!!!! This is due in 1 hour. Thank you so much!!!
PLEASE HELP ME MATH - barb, Saturday, November 13, 2010 at 1:05am
I understand, although mathlab checked it wrong and gave me this problem. I SIMPOLY do not understand this when it comes to radicals. And furthermore mathlab has a habit of checking problems wrong when they are indeed right.I understand how to FOIL, I just do not know how to work the radicals, CAN YOU PLEASE HELP ME!!!! This is due in 1 hour. Thank you so much!!!
PLEASE HELP ME MATH - bobpursley, Saturday, November 13, 2010 at 7:10am
And you are paying for Mathlab?
PLEASE HELP ME MATH - Reiny, Saturday, November 13, 2010 at 8:15am
Just follow MathMate instructions and set it as
(x - 7√7)(x+7√7) = 0
looks like the difference of squares pattern, so ...

x^2 - 343 = 0

then
a=1
b=0
c=-343

try that as input

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