21+62-21x^2=

Solution for 21+62-21x^2= equation:

Simplifying
21 + 62 + -21x2 = 0

Combine like terms: 21 + 62 = 83
83 + -21x2 = 0

Solving
83 + -21x2 = 0

Solving for variable 'x'.

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

Add '-83' to each side of the equation.
83 + -83 + -21x2 = 0 + -83

Combine like terms: 83 + -83 = 0
0 + -21x2 = 0 + -83
-21x2 = 0 + -83

Combine like terms: 0 + -83 = -83
-21x2 = -83

Divide each side by '-21'.
x2 = 3.952380952

Simplifying
x2 = 3.952380952

Take the square root of each side:
x = {-1.988059595, 1.988059595}