Question

Simplifique a expressao (x+1).(x+2)-(x-4).(x-5)

Answer 1

$({x}^{2} + 2x + x + 2) - ( {x}^{2} - 5x - 4x + 20) = \\ {x}^{2} + 2x + x + 2 - {x}^{2} + 5x + 4x - 20 = \\ 12x - 18 = 0 \\ 12x = 18 \\ x = \frac{18 \div 6}{12 \div 6} = \frac{3}{2}$

Answer 2

OI

(x + 1).(x + 2) - (x - 4).(x - 5)

x² + 3x + 2 -(x² - 9x + 20)

x² + 3x + 2 - x² + 9x - 20==>elimina os termos semelhantes (+ e -)

12x - 18

Resposta: 12x - 18

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