Question

PLEASE HELP ME STEP BY STEP FORMULA IN THIS QUESTION​

Answer 1

Answer:

289

Step-by-step explanation:

Sorry I am doing this quick. I need to sleep now.

[(3a+3b)² - 2(3)(a+b)(c)+ (c)²]

It is in form of x²-2ab+y² = (x-y)²

here, x = 3a+3b and y = c

=> (3a+3b-c)²

= [3(5) +3(-7) -(11)]²

= [15-21-11]²

=(-17)²

= 289.

Hope it helps

Good night

Answer 2

Oof I just substituted, I know someone already answered this but I did my work too.