Question

1) Resolva as seguintes equações na variável x, sendo U = R:

a) 2x + 5 = 20
b) 3x +8 = 14
c) X – 20 = 5
d) 8x -5 = 35
e) X + 10 = 15

Answer 1

Resposta:

$\textsf{Leia abaixo}$

Explicação passo-a-passo:

$\mathsf{2x + 5 = 20}$

$\mathsf{2x = 20 - 5}$

$\mathsf{2x = 15}$

$\boxed{\boxed{\mathsf{x = \dfrac{15}{2}}}}$

$\mathsf{3x + 8 = 14}$

$\mathsf{3x = 14 - 8}$

$\mathsf{3x = 6}$

$\boxed{\boxed{\mathsf{x =2}}}$

$\mathsf{x - 20 = 5}$

$\mathsf{x = 5 + 20}$

$\boxed{\boxed{\mathsf{x = 25}}}$

$\mathsf{8x - 5 = 35}$

$\mathsf{8x = 35 + 5}$

$\mathsf{8x = 40}$

$\boxed{\boxed{\mathsf{x = 5}}}$

$\mathsf{x + 10 = 15}$

$\mathsf{x = 15 - 10}$

$\boxed{\boxed{\mathsf{x = 5}}}$