SOLUTION: Can someone figure this problem for me? I don't get it. Evaluate 3*sqrt-64, if possible. I think I wrote this problem correctly, the 3 is above the check mark on the sqrt sy

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: Can someone figure this problem for me? I don't get it. Evaluate 3*sqrt-64, if possible. I think I wrote this problem correctly, the 3 is above the check mark on the sqrt sy      Log On


   

Question 52477This question is from textbook Beginnning Algebra
: Can someone figure this problem for me? I don't get it.
Evaluate 3*sqrt-64, if possible.
I think I wrote this problem correctly, the 3 is above the check mark on the sqrt symbol. This question is from textbook Beginnning Algebra

Found 2 solutions by checkley71, Earlsdon:
Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
IF YOU HAVE 3*SQRT(-64) THEN THE SOLUTION IS 3*-8i or -24i

Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
Evaluate:
Cube root(-64)
You are looking for a negative number that, when it is cubed (multiplied by itself three times) will give you -64.
You could try a few numbers like:
(-2)(-2)(-2) = -8 No good.
(-3)(-3)(-3) = -27 No good.
(-4)(-4)(-4) = -64 Bingo!
So, the cube root of -64 = -4
Or, if you have a calculator, enter: (-64)^(1/3) and then press equals or enter.
%28-64%29%5E%281%2F3%29+=+-4