Help Chapter 3 test tomorrow!

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9m^2-(m-2)^2

(3m)^2 - (m-2)^2 Hint: write 9 = 3^2

(3m+m-2) (3m-(m-2)) Hint: use formula a^2 - b^2 = (a+b)(a-b)

(4m-2) (3m-m+2)

(4m-2) (2m+2)

Hence the factors are (4m-2) (2m+2)

how dod you get the 3m from the 9m

it was given 9m^2,

9 = 3X3 = 3^2

so 9m^2 = 3^2 m^2 = (3m)^2

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