PLEASE HELP!!! Will AWARD BRAINLIEST and give 30 POINTS! Any help is greatly appreciated.

Answer:
-2019
Step-by-step explanation:
x^2 = 2018 * 2020 + 1
x^2 = 4,076,361
x = -2019 or x = 2019
Since x < 0, then x = -2019
Answer:
x = 2019
Step-by-step explanation:
2018 * 2020 + 1 = 4076361
sqrt(4076361) = 2019