Posted by G on Thursday, June 12, 2008 at 12:25pm.
Quadratic Formula
Using +/ for plus or minus
Using \/ radical sign
*****************_________
Formula: b +/ \/b^24ac
********____________________
*****************2a
Equation:
x^2  25 = 0
Books says answer is 5 and 5. I can get the 5. I do not get the 5.

Algebra  Reiny, Thursday, June 12, 2008 at 12:42pm
I don't understand.
Didn't you post the formula with a +/ ?
so in your equation x^2  25 = 0
a = 1
b = 0
c = 25
so x = (0 ±√(04(1)(25))/2
= ±√100 / 2
= ±10/2
= ±5
of course the easier way would be to write the equation as
x^2 = 25 , then
x = ±√25 = ±5 
Algebra  G, Thursday, June 12, 2008 at 12:48pm
Yes I did post it with a +/ representing plus or minus the number.
How were you about to show the + with the minus sign uder the the plus sign?
I looked at the answer you provided I think I can see my error. I was taking 0 for C not the 25. I remember now that C has to be a number without a variable next to it.