Answer:
-3 ; -9/5 ; 3
Explanation:
5x³ - 45x + 9x² - 81 = 0
5x (x²-9) + 9(x²-9) = 0
(x²-9)(5x+9) = 0
x²-9 = 0
x² = 9
x = +√9 = 3
x = -√9 = -3
5x+9 = 0
5x = -9
5/5 x = -9/5
x = -9/5
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