edjiejwi edjiejwi
  • 28-03-2018
  • Mathematics
contestada

(ab - 9)(ab + 8) Please answer.

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gmany
gmany gmany
  • 09-01-2019

[tex]\text{Use FOIL method:}\ (a+b)(c+d)=ac+ad+bc+bd\\\\(ab-9)(ab+8)=(ab)(ab)+(ab)(8)+(-9)(ab)+(-9)(8)\\\\=a^2b^2+8ab-9ab-72\\\\=\boxed{a^2b^2-ab-72}[/tex]

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