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Find zeros of polynomials

p(x)=(3x48x3+15x40)(3x8)2p(x)=(3x^4-8x^3+15x-40)(3x-8)^2
Find all the real number roots of pp and answer the following questions.
How many distinct, real number roots does pp have ?
What is the largest real root of p p\ ?
Give your answer using exact terms.