Answer:
x=3
Explanation:
so...
13=x²+4.
start by subtracting 4 from each side to get the numbers on one side.
13-4=, and 4-4=0
now, we just have 9=x².
to undo a square, one must square root. so,
and
now, x=3.
we have
x²+4=13[From the same external point, the tangent segments to a circle are equal.]
x²=13-4
x²=9
x²=3²
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