SOLUTION: Use complex numbers to factor 5x^2+35 completely. Thank You!!

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Question 989426: Use complex numbers to factor 5x^2+35 completely.
Thank You!!
Answer by thesvw(77) About Me  (Show Source):
You can put this solution on YOUR website!
5x%5E2+%2B+35+=0
5 is a factor and lets ignore it.
5%28x%5E2%2B7%29=0
x%5E2%2B7+=0
x%5E2+=+-7
you have learnt that i%5E2+=+-1
x%5E2+=+7i%5E2
x equals plus or minus sqrt%287%29%2Ai