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For some real number $r,$ the polynomial $8x^3 - 4x^2 - 42x + 45$ is divisible by $(x - r)^2.$ Find $r.$

 Jan 2, 2021
 #1
avatar+112009 
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Could you please post the original address so people can answer on the original?

 

If you can't please say why not.

 Jan 2, 2021
 #2
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https://web2.0calc.com/questions/hard-question_32

 Jan 2, 2021
 #4
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Thank you,

I have deleted the old question since the answer was wrong anyway.

 

Thanks for the answer Alan :)

Melody  Jan 2, 2021
 #3
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Factor the cubic polynomial to get \((2x+5)(2x-3)^2\)

 

This can be written as: \(4(2x+5)(x-\frac{3}{2})^2\)

 

So r = 3/2

 Jan 2, 2021

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