What is the root of x 2 and 4?

x = 2 and x = 4 are the two roots of the given polynomial of degree 4. To find other roots we have to factorize the quadratic equation x² + 8x + 15. x² + 8x + 15 = (x + 3) (x + 5) To find roots, we have to set the linear factors equal to zero.
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