What is the sum sqaure root-2 and sqaure root -18

The correct answer is that 4√- 2 is the simplest radical form of this mathematical expression and 8i (i = imaginary unit) is the solution if we want to find out the square root of a negative signed number.

Step-by-step explanation:

1. Let's write in a mathematical expression the information given:  

Sum square root of -2 and the square root of - 18

√- 2 + √ - 18

√- 2 + √ 9 . - 2 ( 9 * -2 = - 18)

√- 2 +  3 √ - 2  (√ 9 = 3)

4  √- 2

This is the simplest radical form of this mathematical expression.  If we want a concrete number, we should remember that if we refer to the imaginary numbers we can find the solution for √-2 = 2i, or for any other negative number, where i is the imaginary unit. This unit can be used for the development of the square root of negative signed numbers.

Then,

4  √- 2 = 4 (2i) = 8i

The correct answer is that 4√- 2 is the simplest radical form of this mathematical expression and 8i (i = imaginary unit) is the solution if we want to find out the square root of a negative signed number.

the other guy is right

Step-by-step explanation:

i belive those are the ones that are under 90 degreese.