200=4.9t^2+7t

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Solution for 200=4.9t^2+7t equation:


Simplifying
200 = 4.9t2 + 7t

Reorder the terms:
200 = 7t + 4.9t2

Solving
200 = 7t + 4.9t2

Solving for variable 't'.

Reorder the terms:
200 + -7t + -4.9t2 = 7t + -7t + 4.9t2 + -4.9t2

Combine like terms: 7t + -7t = 0
200 + -7t + -4.9t2 = 0 + 4.9t2 + -4.9t2
200 + -7t + -4.9t2 = 4.9t2 + -4.9t2

Combine like terms: 4.9t2 + -4.9t2 = 0.0
200 + -7t + -4.9t2 = 0.0

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

Divide each side by '-4.9'.
-40.81632653 + 1.428571429t + t2 = 0

Move the constant term to the right:

Add '40.81632653' to each side of the equation.
-40.81632653 + 1.428571429t + 40.81632653 + t2 = 0 + 40.81632653

Reorder the terms:
-40.81632653 + 40.81632653 + 1.428571429t + t2 = 0 + 40.81632653

Combine like terms: -40.81632653 + 40.81632653 = 0.00000000
0.00000000 + 1.428571429t + t2 = 0 + 40.81632653
1.428571429t + t2 = 0 + 40.81632653

Combine like terms: 0 + 40.81632653 = 40.81632653
1.428571429t + t2 = 40.81632653

The t term is 1.428571429t.  Take half its coefficient (0.7142857145).
Square it (0.5102040819) and add it to both sides.

Add '0.5102040819' to each side of the equation.
1.428571429t + 0.5102040819 + t2 = 40.81632653 + 0.5102040819

Reorder the terms:
0.5102040819 + 1.428571429t + t2 = 40.81632653 + 0.5102040819

Combine like terms: 40.81632653 + 0.5102040819 = 41.3265306119
0.5102040819 + 1.428571429t + t2 = 41.3265306119

Factor a perfect square on the left side:
(t + 0.7142857145)(t + 0.7142857145) = 41.3265306119

Calculate the square root of the right side: 6.428571429

Break this problem into two subproblems by setting 
(t + 0.7142857145) equal to 6.428571429 and -6.428571429.

Subproblem 1

t + 0.7142857145 = 6.428571429 Simplifying t + 0.7142857145 = 6.428571429 Reorder the terms: 0.7142857145 + t = 6.428571429 Solving 0.7142857145 + t = 6.428571429 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.7142857145' to each side of the equation. 0.7142857145 + -0.7142857145 + t = 6.428571429 + -0.7142857145 Combine like terms: 0.7142857145 + -0.7142857145 = 0.0000000000 0.0000000000 + t = 6.428571429 + -0.7142857145 t = 6.428571429 + -0.7142857145 Combine like terms: 6.428571429 + -0.7142857145 = 5.7142857145 t = 5.7142857145 Simplifying t = 5.7142857145

Subproblem 2

t + 0.7142857145 = -6.428571429 Simplifying t + 0.7142857145 = -6.428571429 Reorder the terms: 0.7142857145 + t = -6.428571429 Solving 0.7142857145 + t = -6.428571429 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.7142857145' to each side of the equation. 0.7142857145 + -0.7142857145 + t = -6.428571429 + -0.7142857145 Combine like terms: 0.7142857145 + -0.7142857145 = 0.0000000000 0.0000000000 + t = -6.428571429 + -0.7142857145 t = -6.428571429 + -0.7142857145 Combine like terms: -6.428571429 + -0.7142857145 = -7.1428571435 t = -7.1428571435 Simplifying t = -7.1428571435

Solution

The solution to the problem is based on the solutions from the subproblems. t = {5.7142857145, -7.1428571435}

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