Question

Qual é a resposta, 3x² + 21 = 0 ? Me ajudem a tirar essa dúvida!

Answer 1

Resposta:

3x2 + -21 = 0

Reorder the terms:

-21 + 3x2 = 0

Solving

-21 + 3x2 = 0

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '21' to each side of the equation.

-21 + 21 + 3x2 = 0 + 21

Combine like terms: -21 + 21 = 0

0 + 3x2 = 0 + 21

3x2 = 0 + 21

Combine like terms: 0 + 21 = 21

3x2 = 21

Divide each side by '3'.

x2 = 7

Simplifying

x2 = 7                  thanks baby

Explicação passo-a-passo: