Question

is the sqrt of 4 - (-5) undefined?

Answer 1

because you cant have a negative for a sqrt?

Answer 2

when you simplify 4 - (-5) what do you get?

Answer 3

√(4 - -5)
√(4 + 5)
√9

The square root of (4 - (-5)) is defined, because even though you can't take the sq.rt. of a negative number, the quantity isn't a negative number. 4 - (-5) is the same as saying 4 + 5, which just equals 9. You can take the square root of 9.

Answer 4

ohhhh 9

Answer 5

you can. at first i also thought it was sqrt(4 -5) = sqrt(-1). but it's not

Answer 6

ya silly

Answer 7

okay thnx =X

Answer 8

\(\large \sqrt{4-(-5)}\implies \sqrt{4-\times (-5)}\implies \sqrt{4-\times (-1\times 5)}\)

Answer 9

The square root is defined, because of the following below \[\sqrt{a+b} \neq \sqrt{a}+\sqrt{b}\] So you MUST evaluate whatever is under the square root before taking the square root.

Answer 10

hahah

Answer 11

shes gonna get confused look at all this math and proofs for why negative * negative = positive

Answer 12

im confused with this - Let h (x ) =sqrt 4 - x . Find h (0) +h (-5) because then it would be 9 and the sqrt of 9 is 3 and that is not one of my answers .........

Answer 13

is there an answer that says no

Answer 14

but "undefined " is so I was pushing the -1

Answer 15

h(0) = sqrt(4-0) = sqrt4 = 2
h(-5) = sqrt(4--5) = sqrt9 = 3

h(0) - h(-5) = 2 - 3 = -1

Answer 16

if it's plus.

h(0) + h(-5) = 5

Answer 17

oh! got it i see now thanks!

Answer 18

I can understand why you were getting confused. So was I. But Dan815 gave the best answer

Answer 19

i totally didn't do the sqrt of 4

Answer 20

haha