Question

Find the product mentally.
(2m - 9)^2

Answer 1

Use the formula: (a-b)² = a² -2ab + b²

(2m-9)² = (2m)² - 2(2m)(9) + 9²

= 4m² - 36m + 81

Answer 2

- - Solve:


`=2m+-9*2m+-9`

`2m*2m+2m*-9+-9*2m+-9*-9`

`4m^2-18m-18m+81`

`4m^2-36m+81`

Your final answer is 4m^2−36m+81