to find 'x' you add 243 to both sides
divide both sides by 3
3x^2/3 = 243/3
x^2 = 81
then take the square root of both sides
hope that helps, be sure to plug your numbers back in to check it take 9 and plug it in for x ::
0=0posted by Brittany
its 3x square root of that - 243
idk if that's how u work it.
idk what this is called
its not finding the x!