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2007-11-08 15:52:03 · 11 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
Only 5 points. Not worth the effort. Do your own homework.
2007-11-08 15:55:58 · answer #1 · answered by chilicooker_mkb 5 · 0⤊ 0⤋
First, you convert the negative notation into i's. I usually place them in front of the square root. i is an imaginary number. So you get i times the square root of 3 that times i times the square root of 27. Then, to figure out if it's negative or not, just do i times i equals i squared, which is -1, so this is negative. Then, you can time the stuff inside the square roots together. So, you should have negative square root of 81. I hope you know what is the sqaure of 81 is, if you don't it's 9.
So you answer should be -9.
2007-11-08 16:20:02 · answer #2 · answered by g0th1cazn 2 · 0⤊ 0⤋
B u break down sqr 27 into sqr 3 and sqr 9 and the 9 breaks down into 3 so ur left with sqr 3 and sqr 3 both with negs or i's same thing, and u mult both sqr's breaking the sqr, so ur left with 3x3 and since 2 negs cancel ur left with pos.
2007-11-08 15:59:42 · answer #3 · answered by ChickiBoy 2 · 0⤊ 0⤋
9. But problem seems wrong. I know you can't compute for the square root of a negative number. But either way, it's still positive 9.
2007-11-08 15:57:51 · answer #4 · answered by Big_R 2 · 0⤊ 0⤋
b and a are correct.
a negative multiplied by a negative is a positive. So, the answers with i in them are eliminated. The question is a poor one. It is likely that your teacher made a mistake unless there is something else you aren't telling us.
2007-11-08 15:55:15 · answer #5 · answered by Your Best Fiend 6 · 0⤊ 0⤋
the square root function allows two solutions
so both a and b are correct
sqrt(-3)*sqrt(-27) = sqrt(-3*-27) = sqrt(81)=+/-9
or you can do it this way
isqrt(3)*isqrt(27) = -sqrt(81) = -/+ 9
2007-11-08 15:58:09 · answer #6 · answered by Anonymous · 0⤊ 0⤋
b. 9
V(-3)*V(-27)
= V(81)
= 9
(the V's are the square root symbol)
2007-11-08 15:56:21 · answer #7 · answered by Anonymous · 0⤊ 0⤋
none of those answers are correct. im taking calculus at uci. the answer is 3i^2 square root 3
(3 i squared, square root 3)
2007-11-08 15:58:37 · answer #8 · answered by Anonymous · 0⤊ 1⤋
it is d
because when u type first one with -3 it gives u 1.732.....i and second one it gives u 5.196.....i and when u multiply them together u will get the number 8.999....i which is rounded off to 9i
2007-11-08 15:59:01 · answer #9 · answered by Yasmeen a 3 · 0⤊ 1⤋
my best guess would be d, but see what everyone else says
that's a toughy
2007-11-08 15:56:01 · answer #10 · answered by . 3 · 0⤊ 1⤋