5x^2+4x^2=84

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Solution for 5x^2+4x^2=84 equation: 


Simplifying
5x2 + 4x2 = 84

Combine like terms: 5x2 + 4x2 = 9x2
9x2 = 84

Solving
9x2 = 84

Solving for variable 'x'.

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

Divide each side by '9'.
x2 = 9.333333333

Simplifying
x2 = 9.333333333

Take the square root of each side:
x = {-3.055050463, 3.055050463}

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