Question

Solve using the square root method. Round to the nearest tenth, if necessary.

x2 + 15 =0

{3.9}


{3.9, -3.9}


{7.5, -7.5}


no real solution

Answer 1

is there a typo in this question?
Don't you mean x^2 -15=0 ?

Answer 2

but if it is
\[ x^2 +15=0 \]
add -15 to both sides
\[ x^2 +15-15 =0-15 \]
simplify.
what do you get ?