Question

Solve the quadratic equation.3x^2=81​

Answer 1

Answer:

3x^2=81

x²=81/3

x=√27=3√3

Answer 2

Step-by-step explanation:

3x²=81

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

$\sqrt{3 {x}^{2} } = \sqrt{81}$

So the x will cancel the square root sign so;

$3x = \sqrt{81}$

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 ;

$\frac{3x}{3} = \frac{9}{3}$

$x = \frac{9}{3}$

$x = 3$