anonymous
  • anonymous
(3m+n)(3m-n) i need work shown step by step
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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bahrom7893
  • bahrom7893
This is (a-b)(a+b), aka difference of two squares
bahrom7893
  • bahrom7893
9m^2-n^2
campbell_st
  • campbell_st
|dw:1332963719138:dw| a simply way is to use a grid, the like terms are on the diagonal and underlined. the answer is 9m^2 + 3mn - 3mn - n^2 which simplifies to 9m^2 - n^2

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anonymous
  • anonymous
Step by step: multiply the left sides of the parenthesis so 3m*3m=9m^2 then multiply the right sides of the parenthesis so n*(-n)=-n^2 then the insides and outsides so 3m*n=3mn and 3m*(-n)=-3mn then add them all together to get 9m^2+3mn-3mn-n^2 and simplify to get 9m^2-n^2
anonymous
  • anonymous
I've never thought to use a grid. That is nifty
kymber
  • kymber
You want to FOIL: First, Outer, Inner, Last. I labelled the steps. After that just simplify. :]|dw:1332963870738:dw|

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