Help me pls

since this is a test, I dont think anyone can help you, as that is cheating. think back to the formulas you've learned in class, and try to figure it out yourself. 

YOU are not passing a test if someone else is answering the questions ! 

I'll give you a tiny hint:

(10x+10)² = [2(6x-8)]² 

Now, you're even more confused