Alegebra
posted by avincent .
w=Cr^2 solve for r

Alegebra 
DrBob222
w = Cr^2
w = C/r^2
wr^2 = C
r^2 = C/w
r = +/ sqrt (C/w)
Check mu work. 
Alegebra 
avincent
i came up with r=sqrt of C/w
what is the +/ for ? could it be either positive or negative? 
Alegebra 
DrBob222
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.
Respond to this Question
Similar Questions

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 
alegebra
I am not good at alegebra F=m+v/2 Then m= what how do you get the answer 
Alegebra
Solve the following equation for x 2y = x / (y + x) 
alegebra
im in 7 th grade but doing alegebra pizzaz riddle why do girls like guys who ear shirts with eight buttons 
Alegebra
Solve for x & y: 3X6Y(6X+34)=30 
alegebra
solve this system of equation using the substitution method. 6x+8y=72 2x+5y=45 
alegebra 2
can you please help me solve this compositions of functions? 
alegebra
solve this equation 2(6v8)2=1312v 
alegebra
solve this equation 4.5(3v0.8)0.83=61.72 
Alegebra
Please solve. 7(w+2)/12 = 2(w7)/6