Tyjanae Tyjanae
  • 23-07-2015
  • Mathematics
contestada

Find the product mentally.

(z - 12)(z + 12)

A: z2 - 144
B: z2 - 24t - 144
C: z2 + 144

Respuesta :

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
Аноним Аноним
  • 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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