-4√x+9=20 what is the answer? please i tried it but im not sure

Question

anonymous · Answer

what answer did you get? also, is the 9 inside the radical?

anonymous · Answer

is it only x under sq rt or (x+9)...?

anonymous · Answer

it doesnt matter, both ways give complex solns

anonymous · Answer

which I am guessing is not what they are after.

anonymous · Answer

no they won't. square root of a number can be negative.

anonymous · Answer

for example -2 can be a root of 4

anonymous · Answer

lol what

anonymous · Answer

irvine, we need your feedback to help you. please respond.

anonymous · Answer

square roots cannot return negative values lol

as soon as you get sqrt(anything ) = negative, theres no soln lol

anonymous · Answer

elecengineer, what is so hard to understand?
$$-4\sqrt(x+9) = 20 \rightarrow \sqrt(x+9) = -5 \rightarrow x+9 = -5^2 \rightarrow x=16$$

anonymous · Answer

sub it back into the original eqn, see if it works :P

anonymous · Answer

-4(5)= 20, whoops

rosey · Answer

u should be a fan of me :)

anonymous · Answer

ah yes, this is not a function. you are right. we only consider the principal square root. my bad. ignore my answers.

anonymous · Answer

i got 'no solution' as the answer and ya the 9 is in the radical

anonymous · Answer

sorry for not anwsering previously i had to do something else