For some real number $r,$ the polynomial $8x^3 - 4x^2 - 42x + 45$ is divisible by $(x - r)^2.$ Find $r.$
Could you please post the original address so people can answer on the original?
If you can't please say why not.
https://web2.0calc.com/questions/hard-question_32
Thank you,
I have deleted the old question since the answer was wrong anyway.
Thanks for the answer Alan :)
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
