I need help with these questions and an explanation of how to complete them to help me study. Thank you!

For questions 188 and 192, use the precise definition of limit to prove the given limits. 188. limz-+2(5x +8 = 18) 192. limx-+2(x2 + 2x = 8) 194. Use the precise definition of limit to prove the given one-sided limits. limx-+0+f (x) = -2, where f(x) = [8x - 3, if x