Definition: In this task you will be given a list of lists, of numbers. For every inner list, you should multiply every number in that list and put the results in your answer. The output should be a list of numbers with the same length as the number of the lists in the input list.
Input: [[-12, -6, 29, 21], [-42, 28, 38, -49]]

[43848, 2189712]