omar3377bdnd omar3377bdnd

01-08-2022
Mathematics

contestada

Find the square.
(7m-3) 2
49m²-21m-9

Respuesta :

reinhard10158 reinhard10158

11-08-2022

Step-by-step explanation:

(7m - 3)² = 49m² - 42m + 9

play it through and do the actual multiplication behind the square :

(7m - 3)² = (7m - 3)(7m - 3) =

= 7m×7m + 7m×(-3) + (-3)×7m + (-3)(-3) =

= 49m² - 2×21m + 9 = 49m² - 42m + 9

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