How to prove these 2 questions by using precise definition of limits. I have tried some steps but don't know how to do any further.

C lim 15x +2 3 b lim X-70 10x +3 2 X- >1 Xz+8 3 Ocl x - ales implies that If ( x )-LICE Ocl x - ales implies that If ( x ) - LICE plug in1 , oc/ x-(1) KS plugin co oc / x - coles 04 1 X - 1 128 plugin f(x) = 15x + 2 plug in f( * ) = Jx2 +8 10 * + 3 1 and L = 3 , ( x=FB ) ( 3) / CE 15x +2 (X248 10x + 3 3 x 248 5 3 ( * 2 + 8 ) 3 ( * 78 ) CE 2 ( 10 * + 3 )