Respuesta :

3(3x-1)^2=21 

(3x-1)^2 = 7 

3x-1 = square root of 7 

3x = square root of 7 - 1 

x = (square root of 7 - 1)/3
27x^2-3=21
27x^2=24

the answer is 27x^s=24
that is my work up there