Solve for $x$x:
$x^2-25=0$x2−25=0
Write all solutions on the same line, separated by commas.
How many real solutions does the following equation have?
Solve for $x$x:
$81x^2-64=0$81x2−64=0
By first factorising the left hand side, solve the equation.
$x^2+12x=0$x2+12x=0