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olya-2409 [2.1K]
1 year ago
11

What are the rational roots for the polynomial shown below? x³ + 5x²-8r-20=0

Mathematics
1 answer:
inessss [21]1 year ago
3 0

x ^{3}  + 5x {}^{2}  - 8 r  - 20 = 0 \\ x { }^{3}  + 5x {}^{2}  - 8r - 20(x {}^{3} + 5x {}^{2}  ) = 0 - (x {}^{3}  + 5x {}^{2} ) \\  - 8r - 20 =  - (x {}^{3}  + 5x {}^{2} ) \\  \\ - 8r - 20 + 20 =  - (x  {}^{3 }  + 5x {}^{2} ) + 20 \\  \\  - 8r = x {}^{3}  - 5x {}^{2}  + 20 \\  \\

hope it is helpful

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