Question

1. $4 + 6k^2 - k^2 - 7k - 5$

Explanation:

Step1: Combine like $k^2$ terms

$6k^2 - k^2 = 5k^2$

Step2: Combine constant terms

$4 - 5 = -1$

Step3: Rewrite with simplified terms

$5k^2 - 7k - 1$

Answer:

$5k^2 - 7k - 1$