Let https://webwork.math.lsu.edu/webwork...5ec9c23431.png.

Find https://webwork.math.lsu.edu/webwork...0322279a31.png -7.

and https://webwork.math.lsu.edu/webwork...f12f126991.png ?

I found the first part equal to -7, but I can't figure out the last part, please help!