21x^2=12+9

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Solution for 21x^2=12+9 equation: 


Simplifying
21x2 = 12 + 9

Combine like terms: 12 + 9 = 21
21x2 = 21

Solving
21x2 = 21

Solving for variable 'x'.

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

Divide each side by '21'.
x2 = 1

Simplifying
x2 = 1

Take the square root of each side:
x = {-1, 1}

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