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a. x²-3x+x-3 = 0
x(x-3)+(x-3) = 0
(x-3) (x+1) = 0
x-3 = 0 V x+1 = 0
x = 3 x = -1
b. x²-2x = 3
x²-2x+1² = 3+1²
(x-1)² = 4
x-1 = +/- 2
x = 1 +/- 2
= 3 atau -1