Question

3x^2-243=

Answer 1

to find 'x' you add 243 to both sides
so:
3x^2=243
divide both sides by 3
3x^2/3 = 243/3
x^2 = 81
then take the square root of both sides
so x=9
hope that helps, be sure to plug your numbers back in to check it take 9 and plug it in for x ::
3(9)^2-243
3(81)-243
243-243=0
0=0

Answer 2

its 3x square root of that - 243
idk if that's how u work it.
idk what this is called

Answer 3

its not finding the x!