Question

2) Encontre a raiz de cada uma das seguintes equações: a) x+8 = 20 b) 4x - 7= 25 ​

Answer 1

Resposta:

$x+8 = 20\\\\\mathrm{Subtrair\:}8\mathrm{\:de\:ambos\:os\:lados}\\\\x+8-8=20-8\\\\\mathrm{Simplificar}\\\\x=12\\\\\\\\\\4x - 7= 25\\\\\mathrm{Adicionar\:}7\mathrm{\:a\:ambos\:os\:lados}\\\\4x-7+7=25+7\\\\\mathrm{Simplificar}\\\\4x=32\\\\\mathrm{Dividir\:ambos\:os\:lados\:por\:}4\\\\\frac{4x}{4}=\frac{32}{4}\\\\\mathrm{Simplificar}\\\\x=8$