Question 1012596
3 to the square root of 21x
Which value of x makes the expression equivalent to 12 to the square root of 21? 
{{{3sqrt(21x)}}} = {{{12sqrt(21)}}}
square both sides
9(21x) = 144(21)
189x = 3024
x = 3024/189
x = 16
:
:
See if that checks out
{{{3sqrt(21*16)}}} = {{{12sqrt(21)}}}
{{{3sqrt(336)}}} = {{{12sqrt(21)}}}
9(336) = 144(21)
3024 = 3024