$\"\"$

The equation is $\"\"$ .

Apply zero product property: $\"\"$ .

$\"\"$

Solve the first equation, $\"\"$ .

Subtract b from each side.

$\"\"$

Divide each side by a.

$\"\"$

Solve the second equation, $\"\"$ .

Add b to each side.

$\"\"$

Divide each side by a.

$\"\"$

$\"\"$ .

$\"\"$

If $\"\"$ , then all real numbers are solutions.

If $\"\"$ , then all real numbers are solutions are $\"\"$ .