Answer:
9a² - 36
Step-by-step explanation:
Area of a parallelogram is A= b*h
Given in the picture
b= 3a +6
h = 3a -6
A = (3a+6) (3a-6)
- we can use that (a+b)(a-b) = a²-b²
A = (3a)² - 6²
= 3²a² - 6²
= 9a² - 36
