Derivative problem order of opeartions

[Press90]

Derivative problem "order of opeartions"

Homework Statement

= lim [75-(10+20h+10h"squared") + (1+h)] - (66)
h-0 h

= lim -19h - 10h"squared"
h-0 h

Homework Equations

So sorry, as this is a simple understanding; which i don't have. But how did the author arrive to the second part of the equation? I forget the order of operations.

The Attempt at a Solution

 

[Dick]

The numerator is 75-(10+20*h+10*h^2)+(1+h)-66. That's the same as 75-10-20*h-10*h^2+1+h-66. Negate the terms in parentheses if there is minus outside, leave them alone if there is a plus outside. Now just combine constants and equal powers of h. Is that your question?