3u^2=-4+15

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Solution for 3u^2=-4+15 equation: 


Simplifying
3u2 = -4 + 15

Combine like terms: -4 + 15 = 11
3u2 = 11

Solving
3u2 = 11

Solving for variable 'u'.

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

Divide each side by '3'.
u2 = 3.666666667

Simplifying
u2 = 3.666666667

Take the square root of each side:
u = {-1.914854216, 1.914854216}

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