Question

Solve using the square root method. Round to the nearest tenth if necessary.
x2 + 15 =0

A.{3.9}
B.{3.9, -3.9}
C.{7.5, -7.5}
D.no real solution

Answer 1

Since
\[x^2 = -15\]
\[x = \sqrt(-15)\]
We are taking the square root of a negative number, thus we only have a complex solution, not a real solution.