can you please explain in the question second I received the anger ?

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Question 1 What method should be used to calculate this limit? Not yet answered Marked out of 1.00 x2 - 4x - 21 lim Remove flag x-7 x2 - 8x +7 Select one: a. multiply the numerator and denominator by the conjugate of the numerator or denominator O b. the factor x to the highest degree should be written before the brackets in the numerator and denominator O c. try to factor the numerator and / or denominator, and then reduce the fraction O d. use direct substitution Question 2 Find the limit of a function Answer saved Marked out of 1.00 8x3 - 3x2 - 5 lim Flag question x+0 4 -3x -2x2 Select one: O a. co O b. 2 O C. 0 O d. -4