SOLUTION: What are the roots of the equation x^2+9=0 I got x=+-3i,can someone explain?
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Question 120476: What are the roots of the equation x^2+9=0 I got x=+-3i,can someone explain?
Answer by tutor_paul(519) (Show Source): You can put this solution on YOUR website!
Get the x^2 term alone:
Take the square root of both sides:
Notice now you have to take the square root of a negative number of the right side. You can re-write this as:
Note that i is defined as follows:
So you can rewrite it as:
the square root of 9 is +/-3. So your final answer is:
x=+/-3i
==============
Good Luck,
tutor_paul@yahoo.com
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