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One of the roots of 2x^3-9x^2+13x+k=0 is x=2.Find the other 2 roots. Explain how you got the answer. 

 Feb 17, 2021

Best Answer 

 #1
avatar+15069 
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One of the roots of 2x^3-9x^2+13x+k=0 is x1=2.Find the other 2 roots. Explain how you got the answer. 

 

Hello whatdoiputhere!

 

(2x39x2+13x+k)  :(x2)=  2x25x+3

 2x34x2_

          5x2+13x

          5x2+10x_

                           3x+k

                           3x6_

                                     0

                      

k=6

2x25x+3=0x22.5x+1.5=0x=1.25±1.2521.5x=1.25±0.25

 

x{1,1.5,2}

laugh  !

 Feb 17, 2021
edited by asinus  Feb 17, 2021
 #1
avatar+15069 
+5
Best Answer

One of the roots of 2x^3-9x^2+13x+k=0 is x1=2.Find the other 2 roots. Explain how you got the answer. 

 

Hello whatdoiputhere!

 

(2x39x2+13x+k)  :(x2)=  2x25x+3

 2x34x2_

          5x2+13x

          5x2+10x_

                           3x+k

                           3x6_

                                     0

                      

k=6

2x25x+3=0x22.5x+1.5=0x=1.25±1.2521.5x=1.25±0.25

 

x{1,1.5,2}

laugh  !

asinus Feb 17, 2021
edited by asinus  Feb 17, 2021

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