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2 x² - 5 x
2 ( 1/2 )² - 5 ( 1/2 )
2(1/4) - 5/2 = 1/2 - 5/2 =- 4/2 = -2
b) x=-1 y=6 remplazamos los valores de x e y
- ( x + y - 5)²
- ( - 1 + 6 - 5 )²
- ( 0)² = 0