Question

quanto vale o x? a) x 2 = 9 b) x 2 = 25 c) x 2 =49 d) x 3 = 8​

Answer 1

Resposta:

a) x² = 9

x = ±√ 3²

x = ±3

b) x² = 25

x = ±√5²

x = ± 5

c) x² = 49

x = ±√7²

x = ± 7

d) x³ = 8

x = ³√2³

x = 2

Answer 2

Resposta:

Decompondo, igualando e eliminando as potencias;

$a)x^{2}=9\\9|3\\3|3\\1\\\\eliminando;\\x^{2}=3^{2}\\x=3\\\\b)x^{2}=25\\25|5\\05|5\\01\\\\eliminando;\\x^{2}=5^{2}\\x=5\\\\c)x^{2}=49\\49|7\\07|7\\01\\\\eliminando;\\x^{2}=7^{2}\\x=7\\\\d)x^{3}=8\\8|2\\4|2\\2|2\\1\\\\eliminando;\\x^{3}=2^{3}\\x=2$

Explicação passo-a-passo: