Please help with explanation

C

Step-by-step explanation:

use the formula = a² + 2ab + b²

(9x)² - 2 * 9x * 7xy + (7xy)²

81x² + 49x²y²- 126x²y

c) 81x² + 49x²y² - 126x²y

Step-by-step explanation:

when you square something you are multiplying it by itself

(9x - 7xy)² = (9x - 7xy) (9x - 7xy)

this requires the FOIL method:

F = first = (9x)(9x) = 81x²

O = outer = (9x)(-7xy) = -63x²y

I = inner = (-7xy)(9x) = -63x²y

L = last = (-7xy)(-7xy) = 49x²y²

the two middle terms can be combined because they are 'like'

-63x²y + -63x²y = -126x²y

81x² - 126x²y + 49x²y²

the order is normally changed to be put in decreasing exponent order so 49x²y² is put before -126x²y

A. Suzy likes reading books

Step-by-step explanation:

The rest are all unfinished or could be rearranged. Some examples below:

B. 'Suzy reads Jacob likes' can be rearranged to 'Suzy reads like Jacob.'

C. 'Suzy and Jacob might like' can be finished to 'Suzy and Jacob might like reading.'

D. 'Suzy and Jacob like' can be finished to 'Suzy and Jacob like reading.'

Also, I would put this into the English category, not math