$\"\"$

The roots are $\"\"$ and $\"\"$ .

Standard form of quadratic equation is $\"\"$ .

$\"\"$ (Substitute $\"\"$ and $\"\"$ )

FOIL method:

The product of two binomials is the sum of the products of the first terms, the outer terms, the inner terms and the last terms.

$\"\"$ (Foil method)

$\"\"$ (Multiply)

$\"\"$ (Combine like terms) $\"\"$

The standard form of the equation is $\"\"$ .