4.905t^2-5t-100=0

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Solution for 4.905t^2-5t-100=0 equation:


Simplifying
4.905t2 + -5t + -100 = 0

Reorder the terms:
-100 + -5t + 4.905t2 = 0

Solving
-100 + -5t + 4.905t2 = 0

Solving for variable 't'.

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

Divide each side by '4.905'.
-20.38735984 + -1.019367992t + t2 = 0

Move the constant term to the right:

Add '20.38735984' to each side of the equation.
-20.38735984 + -1.019367992t + 20.38735984 + t2 = 0 + 20.38735984

Reorder the terms:
-20.38735984 + 20.38735984 + -1.019367992t + t2 = 0 + 20.38735984

Combine like terms: -20.38735984 + 20.38735984 = 0.00000000
0.00000000 + -1.019367992t + t2 = 0 + 20.38735984
-1.019367992t + t2 = 0 + 20.38735984

Combine like terms: 0 + 20.38735984 = 20.38735984
-1.019367992t + t2 = 20.38735984

The t term is -1.019367992t.  Take half its coefficient (-0.509683996).
Square it (0.2597777758) and add it to both sides.

Add '0.2597777758' to each side of the equation.
-1.019367992t + 0.2597777758 + t2 = 20.38735984 + 0.2597777758

Reorder the terms:
0.2597777758 + -1.019367992t + t2 = 20.38735984 + 0.2597777758

Combine like terms: 20.38735984 + 0.2597777758 = 20.6471376158
0.2597777758 + -1.019367992t + t2 = 20.6471376158

Factor a perfect square on the left side:
(t + -0.509683996)(t + -0.509683996) = 20.6471376158

Calculate the square root of the right side: 4.543912149

Break this problem into two subproblems by setting 
(t + -0.509683996) equal to 4.543912149 and -4.543912149.

Subproblem 1

t + -0.509683996 = 4.543912149 Simplifying t + -0.509683996 = 4.543912149 Reorder the terms: -0.509683996 + t = 4.543912149 Solving -0.509683996 + t = 4.543912149 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.509683996' to each side of the equation. -0.509683996 + 0.509683996 + t = 4.543912149 + 0.509683996 Combine like terms: -0.509683996 + 0.509683996 = 0.000000000 0.000000000 + t = 4.543912149 + 0.509683996 t = 4.543912149 + 0.509683996 Combine like terms: 4.543912149 + 0.509683996 = 5.053596145 t = 5.053596145 Simplifying t = 5.053596145

Subproblem 2

t + -0.509683996 = -4.543912149 Simplifying t + -0.509683996 = -4.543912149 Reorder the terms: -0.509683996 + t = -4.543912149 Solving -0.509683996 + t = -4.543912149 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.509683996' to each side of the equation. -0.509683996 + 0.509683996 + t = -4.543912149 + 0.509683996 Combine like terms: -0.509683996 + 0.509683996 = 0.000000000 0.000000000 + t = -4.543912149 + 0.509683996 t = -4.543912149 + 0.509683996 Combine like terms: -4.543912149 + 0.509683996 = -4.034228153 t = -4.034228153 Simplifying t = -4.034228153

Solution

The solution to the problem is based on the solutions from the subproblems. t = {5.053596145, -4.034228153}

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