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a) n2 - 6 = n
n2 + n - 6 = 0
(n + 3)(n - 2) = 0
n1= -3
n2= 2
b) x2 = -6x -9
x2 + 6x + 9 = 0
(x + 3)(x + 3) = 0
x1= -3
x2= -3
c) 12x + 36 = -x2
x2 + 12x + 36 = 0
(x + 6)(x + 6) = 0
x1= -6
x2= -6