4.9t^2-14t-56=0

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Solution for 4.9t^2-14t-56=0 equation:


Simplifying
4.9t2 + -14t + -56 = 0

Reorder the terms:
-56 + -14t + 4.9t2 = 0

Solving
-56 + -14t + 4.9t2 = 0

Solving for variable 't'.

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

Divide each side by '4.9'.
-11.42857143 + -2.857142857t + t2 = 0

Move the constant term to the right:

Add '11.42857143' to each side of the equation.
-11.42857143 + -2.857142857t + 11.42857143 + t2 = 0 + 11.42857143

Reorder the terms:
-11.42857143 + 11.42857143 + -2.857142857t + t2 = 0 + 11.42857143

Combine like terms: -11.42857143 + 11.42857143 = 0.00000000
0.00000000 + -2.857142857t + t2 = 0 + 11.42857143
-2.857142857t + t2 = 0 + 11.42857143

Combine like terms: 0 + 11.42857143 = 11.42857143
-2.857142857t + t2 = 11.42857143

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 = 11.42857143 + 2.040816328

Reorder the terms:
2.040816328 + -2.857142857t + t2 = 11.42857143 + 2.040816328

Combine like terms: 11.42857143 + 2.040816328 = 13.469387758
2.040816328 + -2.857142857t + t2 = 13.469387758

Factor a perfect square on the left side:
(t + -1.428571429)(t + -1.428571429) = 13.469387758

Calculate the square root of the right side: 3.670066451

Break this problem into two subproblems by setting 
(t + -1.428571429) equal to 3.670066451 and -3.670066451.

Subproblem 1

t + -1.428571429 = 3.670066451 Simplifying t + -1.428571429 = 3.670066451 Reorder the terms: -1.428571429 + t = 3.670066451 Solving -1.428571429 + t = 3.670066451 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 = 3.670066451 + 1.428571429 Combine like terms: -1.428571429 + 1.428571429 = 0.000000000 0.000000000 + t = 3.670066451 + 1.428571429 t = 3.670066451 + 1.428571429 Combine like terms: 3.670066451 + 1.428571429 = 5.09863788 t = 5.09863788 Simplifying t = 5.09863788

Subproblem 2

t + -1.428571429 = -3.670066451 Simplifying t + -1.428571429 = -3.670066451 Reorder the terms: -1.428571429 + t = -3.670066451 Solving -1.428571429 + t = -3.670066451 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 = -3.670066451 + 1.428571429 Combine like terms: -1.428571429 + 1.428571429 = 0.000000000 0.000000000 + t = -3.670066451 + 1.428571429 t = -3.670066451 + 1.428571429 Combine like terms: -3.670066451 + 1.428571429 = -2.241495022 t = -2.241495022 Simplifying t = -2.241495022

Solution

The solution to the problem is based on the solutions from the subproblems. t = {5.09863788, -2.241495022}

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