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= 0
5(a-3)² - 320 = 0
5(a² - 6a + 9) - 320 = 0
5a² - 30a + 45 - 320 = 0
5a² - 30a - 275 = 0
a² - 6a - 55 = 0 ----> a = 1 ;b = - 6 ; c= - 55
=
= - 55