4.9t^2-7t-3=0

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Solution for 4.9t^2-7t-3=0 equation:


Simplifying
4.9t2 + -7t + -3 = 0

Reorder the terms:
-3 + -7t + 4.9t2 = 0

Solving
-3 + -7t + 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'.
-0.612244898 + -1.428571429t + t2 = 0

Move the constant term to the right:

Add '0.612244898' to each side of the equation.
-0.612244898 + -1.428571429t + 0.612244898 + t2 = 0 + 0.612244898

Reorder the terms:
-0.612244898 + 0.612244898 + -1.428571429t + t2 = 0 + 0.612244898

Combine like terms: -0.612244898 + 0.612244898 = 0.000000000
0.000000000 + -1.428571429t + t2 = 0 + 0.612244898
-1.428571429t + t2 = 0 + 0.612244898

Combine like terms: 0 + 0.612244898 = 0.612244898
-1.428571429t + t2 = 0.612244898

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 = 0.612244898 + 0.5102040819

Reorder the terms:
0.5102040819 + -1.428571429t + t2 = 0.612244898 + 0.5102040819

Combine like terms: 0.612244898 + 0.5102040819 = 1.1224489799
0.5102040819 + -1.428571429t + t2 = 1.1224489799

Factor a perfect square on the left side:
(t + -0.7142857145)(t + -0.7142857145) = 1.1224489799

Calculate the square root of the right side: 1.059456927

Break this problem into two subproblems by setting 
(t + -0.7142857145) equal to 1.059456927 and -1.059456927.

Subproblem 1

t + -0.7142857145 = 1.059456927 Simplifying t + -0.7142857145 = 1.059456927 Reorder the terms: -0.7142857145 + t = 1.059456927 Solving -0.7142857145 + t = 1.059456927 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 = 1.059456927 + 0.7142857145 Combine like terms: -0.7142857145 + 0.7142857145 = 0.0000000000 0.0000000000 + t = 1.059456927 + 0.7142857145 t = 1.059456927 + 0.7142857145 Combine like terms: 1.059456927 + 0.7142857145 = 1.7737426415 t = 1.7737426415 Simplifying t = 1.7737426415

Subproblem 2

t + -0.7142857145 = -1.059456927 Simplifying t + -0.7142857145 = -1.059456927 Reorder the terms: -0.7142857145 + t = -1.059456927 Solving -0.7142857145 + t = -1.059456927 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 = -1.059456927 + 0.7142857145 Combine like terms: -0.7142857145 + 0.7142857145 = 0.0000000000 0.0000000000 + t = -1.059456927 + 0.7142857145 t = -1.059456927 + 0.7142857145 Combine like terms: -1.059456927 + 0.7142857145 = -0.3451712125 t = -0.3451712125 Simplifying t = -0.3451712125

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.7737426415, -0.3451712125}

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