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Tyjanae Tyjanae
  • 23-07-2015
  • Mathematics
Answered

Find the product mentally.


(z - 12)(z + 12)


A: z2 - 144

B: z2 - 24t - 144

C: z2 + 144

Verified Answer :

cclemeno cclemeno
  • 23-07-2015
A
thinking...
12^2=144
signs different therefore the 12 cancels out (no middle term)
signs different sign is negative

hope this helps
Answer Link
Anonymous Anonymous
  • 23-07-2015

I don't understand what you mean by 'mentally' but anyways, here is how to solve it.

(z−12)(z+12)

=(z+−12)(z+12)

=(z)(z)+(z)(12)+(−12)(z)+(−12)(12)

=z^2+12z−12z−144

=z^2−144

Answer Link

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