If alpha and beta are the zeros of the polynomial 5x^2 + 4x- 9 than evaluate the following : (1) alpha - beta , (2) alpha^2 + beta^2 , (3) alpha^2 - beta^2 , (4) alpha^3 + beta^3 , (5) alpha^3 - beta^3 , (6) alpha^4 - beta^4 .
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