First, distribute 8 to both k and -4, and 8k to both 7k and 8
8(k - 4) = 8k - 32
8k(7k + 8) = 56k² + 64k
Combine like terms
56k² + (64k + 8k) - 32
56k² + 72k - 32
56k² + 72k - 32 is your answer
hope this helps
