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macipope
macipope macipope
  • 05-01-2017
  • Mathematics
Answered

Please help!!


Answer correct for a brainliest and also a thanks , don't answer if you don't know it!

Please help!! Answer correct for a brainliest and also a thanks , don t answer if you don t know it! class=

Verified Answer :

arthurpdc
arthurpdc arthurpdc
  • 05-01-2017

\(20)~7a^4-7b^4=7(a^4-b^4)=7(a^2-b^2)(a^2+b^2)=\\\\=7(a-b)(a+b)(a^2+b^2)\\\\ 21)~x^3+9x^2-52x=x(x^2+9x-52)=x(x-4)(x+13)\)

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