$\"\"$

The quadratic equation is $\"\"$ .

The equation compare to quadratic equation, then x = v, a = 1, b = 12 and c = 20.

Quadratic formula: $\"\"$ .

$\"\"$ (Substitute x = v, a = 1, b = 12 and c = 20)

$\"\"$ (Evaluate power: $\"\"$ )

$\"\"$ (Simplify)

$\"\"$ (Subtract: 144 - 80 = 64) $\"\"$

Evaluate square roots: $\"\"$

$\"\"$

Separate the solutions $\"\"$ .

$\"\"$ (Simplify)

$\"\"$ (Simplify) $\"\"$

The solution set is $\"\"$ .