Answer:9a^2+18a-72
Step-by-step explanation:
9(a+1)^2-81
9(a+1)(a+1)-81
Open brackets
9(a^2+a+a+1)-81
9(a^2+2a+1)-81
9a^2+18a+9-81
9a^2+18a-72
Answer:
2/1 or in better numbers 2
c2=10
8^2+6^2=c2
64+36=120
c2=square root of 120..which is 10
