Please help with a methods question

[almostdonewithschooling]

For the second-last and last one, how did they go from 7/4 to -7/4?

Mod edit: changed thread title from 'Whatt?' to 'Please help with a methods question'

[cookiedream]

For the second-last and last one, how did they go from 7/4 to -7/4?

If you mean -7/2, the -2 outside the brackets was multiplied with both the (x-3/2)^2 and 7/4.
This makes the 7/4 ---> 7/2 (after multiplication with 2). Then 7/2 ---> -7/2 (after multiplication with a negative number)

Hope that makes sense!