X is equal to 5 minus under root 21 by to prove that x cube + 1 by x cube minus 5 x square + 5 by x square + x + 1 by x is equal to zero
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X is equal to 5 minus under root 21 by to prove that x cube + 1 by x cube minus 5 x square + 5 by x square + x + 1 by x is equal to zero =2xcube +1=0
Step-by-step explanation:
xroot21=5
xcube+1x cube-5xsquare+5xsquare+1=0
2xcube+1=0
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