Question

3. expand (2m-n) ² pls help
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Answer 1

Answer:

4m² - 4mn + n²

Step-by-step explanation:

Identity used – (a-b)² = a²-2ab+b²

(2m-n)²

= (2m)² - 2(2m)(n) + (n)²

= 4m² - 4mn + n²

Answer 2

Answer:

its been years i have done this

Step-by-step explanation:

i think this is the formula

(a-b)² = a² - 2ab + b²

(2m -n)² = (2m)² - 2(2m x n) + n²

=.4m² - 4mn+ n²

i feel and hope this may be the answer

another way we can do it without a formula (that isnt expanding tho) the image above the ans is same