4=0*X+0.5*-9.81*X^2

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Solution for 4=0*X+0.5*-9.81*X^2 equation: 


Simplifying
4 = 0X + 0.5 * -9.81X2

Anything times zero is zero.
4 = 0X + 0.5 * -9.81X2

Multiply 0.5 * -9.81
4 = 0 + -4.905X2
Remove the zero:
4 = -4.905X2

Solving
4 = -4.905X2

Solving for variable 'X'.

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

Add '4.905X2' to each side of the equation.
4 + 4.905X2 = -4.905X2 + 4.905X2

Combine like terms: -4.905X2 + 4.905X2 = 0.000
4 + 4.905X2 = 0.000

Add '-4' to each side of the equation.
4 + -4 + 4.905X2 = 0.000 + -4

Combine like terms: 4 + -4 = 0
0 + 4.905X2 = 0.000 + -4
4.905X2 = 0.000 + -4

Combine like terms: 0.000 + -4 = -4
4.905X2 = -4

Divide each side by '4.905'.
X2 = -0.8154943935

Simplifying
X2 = -0.8154943935

Reorder the terms:
0.8154943935 + X2 = -0.8154943935 + 0.8154943935

Combine like terms: -0.8154943935 + 0.8154943935 = 0.0000000000
0.8154943935 + X2 = 0.0000000000

The solution to this equation could not be determined.

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