159k views
5 votes
X^2 +18 =15 could anyone help me with this?

User Vwegert
by
8.4k points

2 Answers

4 votes

Answer: x =
√(-3) or x = 3i

Explanation:

So first you subtract 18 from both sides to cancel out the 18 on the left side.

x^2 = -3

Then you take the square root of both sides in order to get x alone. Then you get an answer of x =
√(-3) which is an imaginary number and can be written as x = 3i.

User David Somekh
by
8.1k points
6 votes

Answer:

x = i√3, -i√3

Explanation:

Simply take the root of both sides, then solve.

User Pnmn
by
8.5k points

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