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Simplifying
5x2 + 4 = 409
Reorder the terms:
4 + 5x2 = 409
Solving
4 + 5x2 = 409
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-4' to each side of the equation.
4 + -4 + 5x2 = 409 + -4
Combine like terms: 4 + -4 = 0
0 + 5x2 = 409 + -4
5x2 = 409 + -4
Combine like terms: 409 + -4 = 405
5x2 = 405
Divide each side by '5'.
x2 = 81
Simplifying
x2 = 81
Take the square root of each side:
x = {-9, 9}
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