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Giải phương trình:

Giải phương trình: display style A subscript x end subscript superscript 3 end superscript plus C subscript x end subscript superscript x minus 2 end superscript equals 14 x

R. Robo.Ctvx30

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table attributes columnalign left columnspacing 1em end attributes row cell A subscript x superscript 3 plus C subscript x superscript x minus 2 end superscript equals 14 x space of 1em d k colon open curly brackets table attributes columnspacing 1em end attributes row cell x greater or equal than 3 end cell row cell x element of N end cell end table close end cell row cell text  Pt  end text not stretchy left right double arrow fraction numerator x factorial over denominator left parenthesis x minus 3 right parenthesis factorial end fraction plus fraction numerator x factorial over denominator left parenthesis x minus 2 right parenthesis factorial times left parenthesis x minus x plus 2 right parenthesis factorial end fraction equals 14 x end cell row cell not stretchy left right double arrow fraction numerator x left parenthesis x minus 1 right parenthesis left parenthesis x minus 2 right parenthesis left parenthesis x minus 3 right parenthesis factorial over denominator left parenthesis x minus 3 right parenthesis factorial end fraction plus fraction numerator x left parenthesis x minus 1 right parenthesis left parenthesis x minus 2 right parenthesis factorial over denominator 2 left parenthesis x minus 2 right parenthesis factorial end fraction equals 14 x end cell row cell not stretchy left right double arrow x left parenthesis x minus 1 right parenthesis left parenthesis x minus 2 right parenthesis plus fraction numerator x left parenthesis x minus 1 right parenthesis over denominator 2 end fraction minus 14 x equals 0 end cell row cell not stretchy left right double arrow x open square brackets left parenthesis x minus 1 right parenthesis left parenthesis x minus 2 right parenthesis plus fraction numerator x minus 1 over denominator 2 end fraction minus 14 close square brackets equals 0 end cell end table

not stretchy left right double arrow open square brackets table attributes columnalign left columnspacing 1em end attributes row cell x equals 0 left parenthesis 1 right parenthesis end cell row cell left parenthesis x minus 1 right parenthesis left parenthesis x minus 2 right parenthesis plus fraction numerator x minus 1 over denominator 2 end fraction minus 14 equals 0 left parenthesis 2 right parenthesis end cell end table close left parenthesis 1 right parenthesis colon space x equals 0 space left parenthesis l right parenthesis

display style table attributes columnalign left columnspacing 1em rowspacing 4 pt end attributes row cell not stretchy left parenthesis 2 not stretchy right parenthesis colon not stretchy left parenthesis x minus 1 not stretchy right parenthesis not stretchy left parenthesis x minus 2 not stretchy right parenthesis plus fraction numerator x minus 1 over denominator 2 end fraction minus 14 equals 0 end cell row cell not stretchy left right double arrow 2 open parentheses x to the power of 2 end exponent minus 3 x plus 2 close parentheses plus x minus 1 minus 28 equals 0 end cell row cell not stretchy left right double arrow 2 x to the power of 2 end exponent minus 5 x minus 25 equals 0 end cell row cell not stretchy left right double arrow open square brackets table attributes columnspacing 1em rowspacing 4 pt end attributes row cell x equals 5 not stretchy left parenthesis n not stretchy right parenthesis end cell row cell x equals fraction numerator negative 5 over denominator 2 end fraction not stretchy left parenthesis I not stretchy right parenthesis end cell end table close end cell end table

1

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3

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