5x^2+21=66

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Solution for 5x^2+21=66 equation: 


Simplifying
5x2 + 21 = 66

Reorder the terms:
21 + 5x2 = 66

Solving
21 + 5x2 = 66

Solving for variable 'x'.

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

Add '-21' to each side of the equation.
21 + -21 + 5x2 = 66 + -21

Combine like terms: 21 + -21 = 0
0 + 5x2 = 66 + -21
5x2 = 66 + -21

Combine like terms: 66 + -21 = 45
5x2 = 45

Divide each side by '5'.
x2 = 9

Simplifying
x2 = 9

Take the square root of each side:
x = {-3, 3}

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