Standard form is y = x 2 − 4 x − 12 Explanation: This is a function of degree 2 i.e. quadratic equation and its standard firm is y = a x 2 + b x + c . Hence, the standard form for y = ( x + 2 ) ( x − 6 ) is = x ( x − 6 ) + 2 ( x − 6 ) = x 2 − 6 x + 2 x − 12 = x 2 − 4 x − 12
