an estimate for the square root of -72 is a -8.1 b -8.5 c -9.1 d -9.5

Question

anonymous · Answer

an estimate for -72 is ____?where is the rest of the question?

a -8.1 
b -8.5 
c -9.1 
d -9.5

anonymous · Answer

well, if I had to guess I would say -8.1, becuase 72/9 = 8...

anonymous · Answer

A negative number does not have a square root! Unless you consider imaginary numbers..which none of your answer choices are.

jdoe0001 · Answer

$\large -\sqrt{72}\qquad or\qquad \sqrt{-72}\quad ?$

smokeysthename · Answer

if it were to be $$-\sqrt{72}$$ than it would be approx. 8.5

anonymous · Answer

thank you smokeysthename

anonymous · Answer

Use the fact that 72 is between 8^2 and 9^2

smokeysthename · Answer

@DemolisionWolf 
they changed the question
@jared101 no prob

anonymous · Answer

ya.. i'm going to balete my comment now...

smokeysthename · Answer

btw if it were to be$$\sqrt{-72}$$
then it would be approx. 8.5i

anonymous · Answer

but what if the negative sign was not in the √

smokeysthename · Answer

then you would apply the negative sign after you found the square root of 72 so in the end the number you found would be negative

smokeysthename · Answer

which in this case is 8.5 so it would be -8.5