Question

Sabendo q A = 6ײ - 3× -8 , B = 5ײ +4× - 3 e C = x² -10× , calcule :

a) A+ B - C =

b) A- B + C =

​

Answer 1

Resposta:

a) A + B - C

${6x}^{2} - 3x - 8 + ( {5x}^{2} + 4x - 3) - ( {x}^{2} - 10x) \\ {6x}^{2} - 3x - 8 + 5 {x}^{2} + 4x - 3 - {x}^{2} + 10x \\ {11x}^{2} + x - 11 - {x}^{2} + 10x \\ {10x}^{2} + 11x + 11$

b) A - B + C

${6x}^{2} - 3x - 8 - ( {5x}^{2} + 4x - 3) + ( {x}^{2} - 10x) \\ {6x}^{2} - 3x - 8 - {5x}^{2} - 4x + 3 + {x}^{2} - 10x \\ {x}^{2} - 7x - 5 + {x}^{2} - 10x \\ {2x}^{2} - 17x - 5$