Question

1) resolva as seguintes equações polinomiais do 1° grau
a)5x-4=3x+12
b) 3+7x=-39
c) 5x-3=9-x
d) 4(x-3)=x-8
e) 10x+5=25​

Answer 1

Explicação passo-a-passo:

a)

$5x-4=3x+12$

$5x - 3x = + 12 + 4$

$2x = 16$

$x = \frac{16}{2}$

$\boxed{x = 8}$

b)

$3+7x=-39$

$7x = - 39 - 3$

$7x = - 42$

$x = \frac{ - 42}{7}$

$\boxed{x = - 6}$

c)

$5x-3=9-x$

$5x + x = + 9 + 3$

$6x = 12$

$x = \frac{12}{6}$

$\boxed{x = 2}$

d)

$4(x-3)=x-8$

$4x - 12 = x - 8$

$4x - x = - 8 + 12$

$3x = + 4$

$\boxed{x = \frac{4}{3} }$

e)

$10x+5=25$

$10x = 25 - 5$

$10x = 20$

$x = \frac{20}{10}$

$\boxed{x = 2}$