SOLUTION: I need help with: (-3

SOLUTION: I need help with: (-3 - radical -7)^2

Question 202898This question is from textbook college algebra
: I need help with: (-3 - radical -7)^2 This question is from textbook college algebra

Answer by jsmallt9(3758) (Show Source): You can put this solution on YOUR website!
It is difficult to know how to interpret "(-3 - radical -7)^2". If it does not mean then please repost the question, using parentheses to make clear what you are try to say.

If the problem is then you must know about Imaginary numbers because if we are limited to Real numbers, we cannot allow .

If means . If we multiply this out we get:

This simplifies to:

and then

which is a complex number (a number with a Real part (-1) and an Imaginary part . We usually write Imaginary numbers interms of "i" which stands for . So we will take and factor out "i":

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