Hello
x² + 2x + 1 < 0 ⇔ (x + 1)² < 0
S = {∅} because a² ≥ 0
First Youre going to want to bring all the y to one side so you’re gonna add +2y to each side, on the right it cancels out so itll be 5y-4=6, next your are going to add +4 to each side on the left it cancels out now you will have 5y=10, now you are gonna divide each side by 5, so youre answer will be y=2
Since 36 is 3 x 12
then you just multiply 5 by 3
5 x 3 = 15
you would need 15 litres of yoda soda
i hope this helps you
YX=2, I assume you need to get the 'X' and 'Y' alone. Also just for future reference, you're trying to get variables alone and all the numbers on the other side. Lastly, whatever you do to one side you do to the other. Good luck!