Question

$( \sqrt{6x - 9} ) \times 7 = 21$
​

Answer 1

Respuesta:

$( \sqrt{6x - 9} ) \times 7 = 21 \\ ( \sqrt{6x - 9}) = 21 \div 7 \\ \sqrt{6x - 9} = 3 \\ 6x - 9 = {3}^{2} \\ 6x - 9 = 9 \\ 6x = 9 + 9 \\ 6x = 18 \\ x = 18 \div 6 \\ x = 3 \\ comprobación \\ ( \sqrt{6 \times 3 - 9} ) \times 7 = 21 \\ ( \sqrt{18 - 9} ) \times 7 = 21 \\ ( \sqrt{9} ) \times 7 = 21 \\ 3 \times 7 = 21 \\ 21 = 21$