anonymous
  • anonymous
Find the square. (7m - 3)^2
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
(7m - 3)(7m - 3) and distribute. Or use the trinomial if you memorized it.
anonymous
  • anonymous
\(49m^2 -42m +9\)
anonymous
  • anonymous
never done this can you write it out to the answer

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anonymous
  • anonymous
It is pointless copying down answers, you will never learn this way.
anonymous
  • anonymous
that's why i asked you to write it out? :)
anonymous
  • anonymous
You should memorise these 3 formulas: \[(a+b)^2 = a^2 + 2ab + b^2\] \[(a-b)^2 = a^2 - 2ab + b^2\] \[(a+b)(a-b) = a^2 - b^2\]
anonymous
  • anonymous
Apply formula 2 to this question. (7m - 3)^2 a = 7m b = -3 Is the asnwer obvious?
anonymous
  • anonymous
Bd2zBone is right @WooTangClanANTFW
anonymous
  • anonymous
so if the question is (2n + 2)(2n - 2) for finding the product do i use the third formula?
anonymous
  • anonymous
Yes.
anonymous
  • anonymous
So 2n + 2 is 4n? right...
anonymous
  • anonymous
or 4n^2 i dont see where the power comes from
anonymous
  • anonymous
(2n + 2)(2n - 2) a = 2n b = 2 so what is a^2 and what is b^2?
anonymous
  • anonymous
? so its 2n^2? and 2^2?
anonymous
  • anonymous
\[(2n)^2 = 2^2n^2 = 4n^2\] \[2^2 = 4\] \[4n^2 - 4\]

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