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x1 + x2 = 3/2
x1x2 = -9/2
x1² + x2² = (x1 + x2)² - 2x1x2
= (3/2)² - 2(-9/2)
= 9/4 + 9
= 9/4 + 36/4
= 45/4
= 11,25