4x^2-20+21=0

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Solution for 4x^2-20+21=0 equation:


Simplifying
4x2 + -20 + 21 = 0

Reorder the terms:
-20 + 21 + 4x2 = 0

Combine like terms: -20 + 21 = 1
1 + 4x2 = 0

Solving
1 + 4x2 = 0

Solving for variable 'x'.

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

Add '-1' to each side of the equation.
1 + -1 + 4x2 = 0 + -1

Combine like terms: 1 + -1 = 0
0 + 4x2 = 0 + -1
4x2 = 0 + -1

Combine like terms: 0 + -1 = -1
4x2 = -1

Divide each side by '4'.
x2 = -0.25

Simplifying
x2 = -0.25

Reorder the terms:
0.25 + x2 = -0.25 + 0.25

Combine like terms: -0.25 + 0.25 = 0.00
0.25 + x2 = 0.00

The solution to this equation could not be determined.

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