4-21x^2=-3

Solution for 4-21x^2=-3 equation:

Simplifying
4 + -21x2 = -3

Solving
4 + -21x2 = -3

Solving for variable 'x'.

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

Add '-4' to each side of the equation.
4 + -4 + -21x2 = -3 + -4

Combine like terms: 4 + -4 = 0
0 + -21x2 = -3 + -4
-21x2 = -3 + -4

Combine like terms: -3 + -4 = -7
-21x2 = -7

Divide each side by '-21'.
x2 = 0.3333333333

Simplifying
x2 = 0.3333333333

Take the square root of each side:
x = {-0.577350269, 0.577350269}