4x^2+5=21

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Solution for 4x^2+5=21 equation: 


Simplifying
4x2 + 5 = 21

Reorder the terms:
5 + 4x2 = 21

Solving
5 + 4x2 = 21

Solving for variable 'x'.

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

Add '-5' to each side of the equation.
5 + -5 + 4x2 = 21 + -5

Combine like terms: 5 + -5 = 0
0 + 4x2 = 21 + -5
4x2 = 21 + -5

Combine like terms: 21 + -5 = 16
4x2 = 16

Divide each side by '4'.
x2 = 4

Simplifying
x2 = 4

Take the square root of each side:
x = {-2, 2}

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