Question

AB=3.2cm,CD=4.5cm , then 9AB^2- 4CD^2​

Answer 1

Step-by-step explanation:

9(AB)² - 4(CD)²

{(3AB)² - (2CD)²}

(3AB+2CD)(3AB-2CD)

(9.6+9)(9.6-9)

18.6 * 0.6

11.16