Solve the following equation for $x$x:

$x^2=25$x2=25

Write all solutions on the same line, separated by commas.

$x^2=81$x2=81

Solve for $x$x:

$x^2-25=0$x2−25=0

How many real solutions does the equation $x^2+64=0$x2+64=0 have?