What's 9 in index form
2 answers:
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If you expand the square, you have
Simplify the right hand side:
Cancel the -3x appearing on both sides:
Multiply both sides by 4:
Consider the square root of both terms (using the doubles sign):
The answer is above.
Additional note 1:
Additional note 2:
In the answer I filled in "0" at the place where "n" was. This is because the question tells us n=0