10x^2-9=21

Solution for 10x^2-9=21 equation:

Simplifying
10x2 + -9 = 21

Reorder the terms:
-9 + 10x2 = 21

Solving
-9 + 10x2 = 21

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '9' to each side of the equation.
-9 + 9 + 10x2 = 21 + 9

Combine like terms: -9 + 9 = 0
0 + 10x2 = 21 + 9
10x2 = 21 + 9

Combine like terms: 21 + 9 = 30
10x2 = 30

Divide each side by '10'.
x2 = 3

Simplifying
x2 = 3

Take the square root of each side:
x = {-1.732050808, 1.732050808}