8=2+14t-4.9t^2

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Solution for 8=2+14t-4.9t^2 equation:


Simplifying
8 = 2 + 14t + -4.9t2

Solving
8 = 2 + 14t + -4.9t2

Solving for variable 't'.

Combine like terms: 8 + -2 = 6
6 + -14t + 4.9t2 = 2 + 14t + -4.9t2 + -2 + -14t + 4.9t2

Reorder the terms:
6 + -14t + 4.9t2 = 2 + -2 + 14t + -14t + -4.9t2 + 4.9t2

Combine like terms: 2 + -2 = 0
6 + -14t + 4.9t2 = 0 + 14t + -14t + -4.9t2 + 4.9t2
6 + -14t + 4.9t2 = 14t + -14t + -4.9t2 + 4.9t2

Combine like terms: 14t + -14t = 0
6 + -14t + 4.9t2 = 0 + -4.9t2 + 4.9t2
6 + -14t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
6 + -14t + 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'.
1.224489796 + -2.857142857t + t2 = 0

Move the constant term to the right:

Add '-1.224489796' to each side of the equation.
1.224489796 + -2.857142857t + -1.224489796 + t2 = 0 + -1.224489796

Reorder the terms:
1.224489796 + -1.224489796 + -2.857142857t + t2 = 0 + -1.224489796

Combine like terms: 1.224489796 + -1.224489796 = 0.000000000
0.000000000 + -2.857142857t + t2 = 0 + -1.224489796
-2.857142857t + t2 = 0 + -1.224489796

Combine like terms: 0 + -1.224489796 = -1.224489796
-2.857142857t + t2 = -1.224489796

The t term is -2.857142857t.  Take half its coefficient (-1.428571429).
Square it (2.040816328) and add it to both sides.

Add '2.040816328' to each side of the equation.
-2.857142857t + 2.040816328 + t2 = -1.224489796 + 2.040816328

Reorder the terms:
2.040816328 + -2.857142857t + t2 = -1.224489796 + 2.040816328

Combine like terms: -1.224489796 + 2.040816328 = 0.816326532
2.040816328 + -2.857142857t + t2 = 0.816326532

Factor a perfect square on the left side:
(t + -1.428571429)(t + -1.428571429) = 0.816326532

Calculate the square root of the right side: 0.903507904

Break this problem into two subproblems by setting 
(t + -1.428571429) equal to 0.903507904 and -0.903507904.

Subproblem 1

t + -1.428571429 = 0.903507904 Simplifying t + -1.428571429 = 0.903507904 Reorder the terms: -1.428571429 + t = 0.903507904 Solving -1.428571429 + t = 0.903507904 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.428571429' to each side of the equation. -1.428571429 + 1.428571429 + t = 0.903507904 + 1.428571429 Combine like terms: -1.428571429 + 1.428571429 = 0.000000000 0.000000000 + t = 0.903507904 + 1.428571429 t = 0.903507904 + 1.428571429 Combine like terms: 0.903507904 + 1.428571429 = 2.332079333 t = 2.332079333 Simplifying t = 2.332079333

Subproblem 2

t + -1.428571429 = -0.903507904 Simplifying t + -1.428571429 = -0.903507904 Reorder the terms: -1.428571429 + t = -0.903507904 Solving -1.428571429 + t = -0.903507904 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.428571429' to each side of the equation. -1.428571429 + 1.428571429 + t = -0.903507904 + 1.428571429 Combine like terms: -1.428571429 + 1.428571429 = 0.000000000 0.000000000 + t = -0.903507904 + 1.428571429 t = -0.903507904 + 1.428571429 Combine like terms: -0.903507904 + 1.428571429 = 0.525063525 t = 0.525063525 Simplifying t = 0.525063525

Solution

The solution to the problem is based on the solutions from the subproblems. t = {2.332079333, 0.525063525}

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