donnacouch01 donnacouch01
  • 06-02-2020
  • Mathematics
contestada

Which is the value of this expression when a = 5 and k = negative 2? (3^2 a^-3)(3 a^-4)^-2

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sam4040
sam4040 sam4040
  • 12-02-2020

Answer:

[tex]5^5=3125[/tex]

Step-by-step explanation:

[tex]Given\ (3^2a^{-3})(3a^{-4})^{-2}\\\\=3^2a^{-3}\cdot(3)^{-2}(a^{-4})^{-2}\\\\=3^2\times3^{-2}\times a^{-3}\times a^8\ \ \ \ \ \ (x^{-m})^{-n}=x^{mn}\\\\=3^{2-2}\times a^{-3+8}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ x^m\times x^n=x^{m+n}\\\\=3^0\times a^5\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ x^0=1\\\\=1\times a^5\\\\=a^5\\\\put\ value\ a=5\\\\=5^5\\\\=3125[/tex]

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