Question

Solve the quadratic equation.
3x^2=81​

Answer 1

3x^2=81

x²=81/3

x=√27=3√3

Answer 2

Explanation:

3x²=81

With this we have to square root both sides to find the value of x.

`\sqrt{3 {x}^(2) } = √(81)`

So the x will cancel the square root sign so;

`3x = √(81)`

And now we have to find the square root of 81 which is 9, because when we multiply 9 by 9 we are going to be get 81 so the square of 9 is 81 and the square root of 81 is 9

So;

`3x = 9`

And then we divide both sides by 3 to find the value of x ;

`(3x)/(3) = (9)/(3)`

`x = (9)/(3)`

`x = 3`