Question

resolva todas as equações pfv é pra hoje me ajudem!!! valendo 25 pontos



1) x+3=0

2) 7-x=5

3) 8+x=-2

4) 2(-3-x)-2x=3

5) 2x+3=5

6) 2x+8(1-x)=20+x

7) -2x = 4

8) -3x+3=6


​

Answer 1

Resposta:

1)

$x + 3 = 0 \\ \\ \red{x = - 3}$

2)

$7 - x = 5 \\ \\ 5 = 7 - x \\ \\ x = 7 - 5 \\ \\ \red{x = 2}$

3)

$8 + x \: = - 2 \\ \\ x = - 2 - 8 \\ \\ \red{x = - 10}$

4)

$2( - 3 - x) - 2x = 3 \\ \\ - 6 - 2x - 2x = 3 \\ \\ - 6 - 4x = 3 \\ \\ 3 = - 6 - 4x \\ \\ 4x = - 6 - 3 \\ \\ 4x = - 9 \\ \\ \red{x = - \dfrac{9}{4} }$

5)

$2x + 3 = 5 \\ \\ 2x = 5 - 3 \\ \\ 2x = 2 \\ \\ x = \frac{2}{2} \\ \\ \red{ x = 1}$

6)

$2x + 8.(1 - x) = 20 + x \\ \\ 2x + 8 - 8x = 20 + x \\ \\ - 6x + 8 = 20 + x \\ \\ 20 + x = - 6x + 8 \\ \\ x + 6x = 8 - 20 \\ \\ 7x = - 12 \\ \\ \red{x = - \dfrac{12}{7} }$

7)

$- 2x = 4 \\ \\ x = - \frac{4}{2} \\ \\ \red{ x = - 2}$

8)

$- 3x + 3 = 6 \\ \\ 6 = - 3x + 3 \\ \\ 3x = 3 - 6 \\ \\ 3x = - 3 \\ \\ x = - \frac{3}{3} \\ \\ \red{x = - 1}$

Bons Estudos!