200=68t-4.9t^2

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Solution for 200=68t-4.9t^2 equation:


Simplifying
200 = 68t + -4.9t2

Solving
200 = 68t + -4.9t2

Solving for variable 't'.

Reorder the terms:
200 + -68t + 4.9t2 = 68t + -68t + -4.9t2 + 4.9t2

Combine like terms: 68t + -68t = 0
200 + -68t + 4.9t2 = 0 + -4.9t2 + 4.9t2
200 + -68t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
200 + -68t + 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 + -13.87755102t + t2 = 0

Move the constant term to the right:

Add '-40.81632653' to each side of the equation.
40.81632653 + -13.87755102t + -40.81632653 + t2 = 0 + -40.81632653

Reorder the terms:
40.81632653 + -40.81632653 + -13.87755102t + t2 = 0 + -40.81632653

Combine like terms: 40.81632653 + -40.81632653 = 0.00000000
0.00000000 + -13.87755102t + t2 = 0 + -40.81632653
-13.87755102t + t2 = 0 + -40.81632653

Combine like terms: 0 + -40.81632653 = -40.81632653
-13.87755102t + t2 = -40.81632653

The t term is -13.87755102t.  Take half its coefficient (-6.93877551).
Square it (48.14660558) and add it to both sides.

Add '48.14660558' to each side of the equation.
-13.87755102t + 48.14660558 + t2 = -40.81632653 + 48.14660558

Reorder the terms:
48.14660558 + -13.87755102t + t2 = -40.81632653 + 48.14660558

Combine like terms: -40.81632653 + 48.14660558 = 7.33027905
48.14660558 + -13.87755102t + t2 = 7.33027905

Factor a perfect square on the left side:
(t + -6.93877551)(t + -6.93877551) = 7.33027905

Calculate the square root of the right side: 2.707448808

Break this problem into two subproblems by setting 
(t + -6.93877551) equal to 2.707448808 and -2.707448808.

Subproblem 1

t + -6.93877551 = 2.707448808 Simplifying t + -6.93877551 = 2.707448808 Reorder the terms: -6.93877551 + t = 2.707448808 Solving -6.93877551 + t = 2.707448808 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '6.93877551' to each side of the equation. -6.93877551 + 6.93877551 + t = 2.707448808 + 6.93877551 Combine like terms: -6.93877551 + 6.93877551 = 0.00000000 0.00000000 + t = 2.707448808 + 6.93877551 t = 2.707448808 + 6.93877551 Combine like terms: 2.707448808 + 6.93877551 = 9.646224318 t = 9.646224318 Simplifying t = 9.646224318

Subproblem 2

t + -6.93877551 = -2.707448808 Simplifying t + -6.93877551 = -2.707448808 Reorder the terms: -6.93877551 + t = -2.707448808 Solving -6.93877551 + t = -2.707448808 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '6.93877551' to each side of the equation. -6.93877551 + 6.93877551 + t = -2.707448808 + 6.93877551 Combine like terms: -6.93877551 + 6.93877551 = 0.00000000 0.00000000 + t = -2.707448808 + 6.93877551 t = -2.707448808 + 6.93877551 Combine like terms: -2.707448808 + 6.93877551 = 4.231326702 t = 4.231326702 Simplifying t = 4.231326702

Solution

The solution to the problem is based on the solutions from the subproblems. t = {9.646224318, 4.231326702}

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