The quadratic expression (x+4)(x-8) is written in factored term. A. Write the expression in standard form ax^2+bx+c

a.   standard  form

(x + 4)  ( x - 8)     expand

x^2  +  4x  -  8x  - 32

x^2   -  4x   - 32

b. vertex  form

complete the  square  on x

x^2  - 4x +  4  -  32  +  4       factor  the  first three terms and simplify

( x - 2)^2   -  28