3x^2-243=
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
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!
To solve the equation 3x^2 - 243 = 0, we can follow these steps:
Step 1: Move the constant term to the other side of the equation:
3x^2 = 243
Step 2: Divide both sides of the equation by the coefficient of x^2, which is 3:
(3x^2) / 3 = 243 / 3
x^2 = 81
Step 3: Take the square root of both sides of the equation:
√(x^2) = √81
x = ± 9
Therefore, the solutions to the given equation are x = 9 and x = -9.