SOLUTION: what are the steps for solving for x when x has an exponent. EX: -5x^2+20=0

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Question 665848: what are the steps for solving for x when x has an exponent. EX: -5x^2+20=0
Found 2 solutions by Alan3354, ReadingBoosters:
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
-5x^2+20=0
============
-5x%5E2%2B20=0
5x%5E2+=+20
x%5E2+=+4
x = +2
x = -2

Answer by ReadingBoosters(3246) About Me  (Show Source):
You can put this solution on YOUR website!
Starting with
-5x%5E2+%2B+20+=+0
...
Isolate x
-5x%5E2 = -20
Divide both sides by -5
cross%28-5%29x%5E2%2Fcross%28-5%29 = %28-20%29%2F-5
...
x%5E2+=+4
Take the square root of both sides
sqrt%28x%5E2%29+=+sqrt%284%29
x = 2
.....................
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