16=-71.88x+-4.9x^2

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Solution for 16=-71.88x+-4.9x^2 equation:


Simplifying
16 = -71.88x + -4.9x2

Solving
16 = -71.88x + -4.9x2

Solving for variable 'x'.

Reorder the terms:
16 + 71.88x + 4.9x2 = -71.88x + 71.88x + -4.9x2 + 4.9x2

Combine like terms: -71.88x + 71.88x = 0.00
16 + 71.88x + 4.9x2 = 0.00 + -4.9x2 + 4.9x2
16 + 71.88x + 4.9x2 = -4.9x2 + 4.9x2

Combine like terms: -4.9x2 + 4.9x2 = 0.0
16 + 71.88x + 4.9x2 = 0.0

Begin completing the square.  Divide all terms by
4.9 the coefficient of the squared term: 

Divide each side by '4.9'.
3.265306122 + 14.66938776x + x2 = 0

Move the constant term to the right:

Add '-3.265306122' to each side of the equation.
3.265306122 + 14.66938776x + -3.265306122 + x2 = 0 + -3.265306122

Reorder the terms:
3.265306122 + -3.265306122 + 14.66938776x + x2 = 0 + -3.265306122

Combine like terms: 3.265306122 + -3.265306122 = 0.000000000
0.000000000 + 14.66938776x + x2 = 0 + -3.265306122
14.66938776x + x2 = 0 + -3.265306122

Combine like terms: 0 + -3.265306122 = -3.265306122
14.66938776x + x2 = -3.265306122

The x term is 14.66938776x.  Take half its coefficient (7.33469388).
Square it (53.79773431) and add it to both sides.

Add '53.79773431' to each side of the equation.
14.66938776x + 53.79773431 + x2 = -3.265306122 + 53.79773431

Reorder the terms:
53.79773431 + 14.66938776x + x2 = -3.265306122 + 53.79773431

Combine like terms: -3.265306122 + 53.79773431 = 50.532428188
53.79773431 + 14.66938776x + x2 = 50.532428188

Factor a perfect square on the left side:
(x + 7.33469388)(x + 7.33469388) = 50.532428188

Calculate the square root of the right side: 7.108616475

Break this problem into two subproblems by setting 
(x + 7.33469388) equal to 7.108616475 and -7.108616475.

Subproblem 1

x + 7.33469388 = 7.108616475 Simplifying x + 7.33469388 = 7.108616475 Reorder the terms: 7.33469388 + x = 7.108616475 Solving 7.33469388 + x = 7.108616475 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7.33469388' to each side of the equation. 7.33469388 + -7.33469388 + x = 7.108616475 + -7.33469388 Combine like terms: 7.33469388 + -7.33469388 = 0.00000000 0.00000000 + x = 7.108616475 + -7.33469388 x = 7.108616475 + -7.33469388 Combine like terms: 7.108616475 + -7.33469388 = -0.226077405 x = -0.226077405 Simplifying x = -0.226077405

Subproblem 2

x + 7.33469388 = -7.108616475 Simplifying x + 7.33469388 = -7.108616475 Reorder the terms: 7.33469388 + x = -7.108616475 Solving 7.33469388 + x = -7.108616475 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7.33469388' to each side of the equation. 7.33469388 + -7.33469388 + x = -7.108616475 + -7.33469388 Combine like terms: 7.33469388 + -7.33469388 = 0.00000000 0.00000000 + x = -7.108616475 + -7.33469388 x = -7.108616475 + -7.33469388 Combine like terms: -7.108616475 + -7.33469388 = -14.443310355 x = -14.443310355 Simplifying x = -14.443310355

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.226077405, -14.443310355}

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