# Alegebra

posted by .

w=Cr^-2 solve for r

• Alegebra -

w = Cr^-2
w = C/r^2
wr^2 = C
r^2 = C/w
r = +/- sqrt (C/w)
Check mu work.

• Alegebra -

i came up with r=sqrt of C/w
what is the +/- for ? could it be either positive or negative?

• Alegebra -

ANYTIME you take the square root of something, you get a + or -. Let me show you why.
Take the square root of 4. That is 2. Now if we multiply +2 x +2 we get +4. BUT if we multiply -2 x -2 we also get +4. So the square root of 4 is +/- 2. Same with anything else because a minus number x a minus number = a + number.

## Similar Questions

1. ### Alegebra

Find - x when x =20 answer is -20 Evaluate m/n for m=16 and n=2 m/n=8 is the problem right. I am not good with alegebra
2. ### alegebra

I am not good at alegebra F=m+v/2 Then m= what how do you get the answer
3. ### Alegebra

Solve the following equation for x 2y = x / (y + x)
4. ### alegebra

im in 7 th grade but doing alegebra pizzaz riddle why do girls like guys who ear shirts with eight buttons
5. ### Alegebra

Solve for x & y: 3X-6Y(-6X+34)=30
6. ### alegebra

solve this system of equation using the substitution method. 6x+8y=72 2x+5y=45