0=-4.9t^2+9.1t+1.4

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Solution for 0=-4.9t^2+9.1t+1.4 equation:


Simplifying
0 = -4.9t2 + 9.1t + 1.4

Reorder the terms:
0 = 1.4 + 9.1t + -4.9t2

Solving
0 = 1.4 + 9.1t + -4.9t2

Solving for variable 't'.

Combine like terms: 0 + -1.4 = -1.4
-1.4 + -9.1t + 4.9t2 = 1.4 + 9.1t + -4.9t2 + -1.4 + -9.1t + 4.9t2

Reorder the terms:
-1.4 + -9.1t + 4.9t2 = 1.4 + -1.4 + 9.1t + -9.1t + -4.9t2 + 4.9t2

Combine like terms: 1.4 + -1.4 = 0.0
-1.4 + -9.1t + 4.9t2 = 0.0 + 9.1t + -9.1t + -4.9t2 + 4.9t2
-1.4 + -9.1t + 4.9t2 = 9.1t + -9.1t + -4.9t2 + 4.9t2

Combine like terms: 9.1t + -9.1t = 0.0
-1.4 + -9.1t + 4.9t2 = 0.0 + -4.9t2 + 4.9t2
-1.4 + -9.1t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
-1.4 + -9.1t + 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'.
-0.2857142857 + -1.857142857t + t2 = 0

Move the constant term to the right:

Add '0.2857142857' to each side of the equation.
-0.2857142857 + -1.857142857t + 0.2857142857 + t2 = 0 + 0.2857142857

Reorder the terms:
-0.2857142857 + 0.2857142857 + -1.857142857t + t2 = 0 + 0.2857142857

Combine like terms: -0.2857142857 + 0.2857142857 = 0.0000000000
0.0000000000 + -1.857142857t + t2 = 0 + 0.2857142857
-1.857142857t + t2 = 0 + 0.2857142857

Combine like terms: 0 + 0.2857142857 = 0.2857142857
-1.857142857t + t2 = 0.2857142857

The t term is -1.857142857t.  Take half its coefficient (-0.9285714285).
Square it (0.8622448978) and add it to both sides.

Add '0.8622448978' to each side of the equation.
-1.857142857t + 0.8622448978 + t2 = 0.2857142857 + 0.8622448978

Reorder the terms:
0.8622448978 + -1.857142857t + t2 = 0.2857142857 + 0.8622448978

Combine like terms: 0.2857142857 + 0.8622448978 = 1.1479591835
0.8622448978 + -1.857142857t + t2 = 1.1479591835

Factor a perfect square on the left side:
(t + -0.9285714285)(t + -0.9285714285) = 1.1479591835

Calculate the square root of the right side: 1.071428571

Break this problem into two subproblems by setting 
(t + -0.9285714285) equal to 1.071428571 and -1.071428571.

Subproblem 1

t + -0.9285714285 = 1.071428571 Simplifying t + -0.9285714285 = 1.071428571 Reorder the terms: -0.9285714285 + t = 1.071428571 Solving -0.9285714285 + t = 1.071428571 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.9285714285' to each side of the equation. -0.9285714285 + 0.9285714285 + t = 1.071428571 + 0.9285714285 Combine like terms: -0.9285714285 + 0.9285714285 = 0.0000000000 0.0000000000 + t = 1.071428571 + 0.9285714285 t = 1.071428571 + 0.9285714285 Combine like terms: 1.071428571 + 0.9285714285 = 1.9999999995 t = 1.9999999995 Simplifying t = 1.9999999995

Subproblem 2

t + -0.9285714285 = -1.071428571 Simplifying t + -0.9285714285 = -1.071428571 Reorder the terms: -0.9285714285 + t = -1.071428571 Solving -0.9285714285 + t = -1.071428571 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.9285714285' to each side of the equation. -0.9285714285 + 0.9285714285 + t = -1.071428571 + 0.9285714285 Combine like terms: -0.9285714285 + 0.9285714285 = 0.0000000000 0.0000000000 + t = -1.071428571 + 0.9285714285 t = -1.071428571 + 0.9285714285 Combine like terms: -1.071428571 + 0.9285714285 = -0.1428571425 t = -0.1428571425 Simplifying t = -0.1428571425

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.9999999995, -0.1428571425}

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