100=-19.97*t+4.9*t^2

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Solution for 100=-19.97*t+4.9*t^2 equation:


Simplifying
100 = -19.97t + 4.9t2

Solving
100 = -19.97t + 4.9t2

Solving for variable 't'.

Reorder the terms:
100 + 19.97t + -4.9t2 = -19.97t + 19.97t + 4.9t2 + -4.9t2

Combine like terms: -19.97t + 19.97t = 0.00
100 + 19.97t + -4.9t2 = 0.00 + 4.9t2 + -4.9t2
100 + 19.97t + -4.9t2 = 4.9t2 + -4.9t2

Combine like terms: 4.9t2 + -4.9t2 = 0.0
100 + 19.97t + -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'.
-20.40816327 + -4.075510204t + t2 = 0

Move the constant term to the right:

Add '20.40816327' to each side of the equation.
-20.40816327 + -4.075510204t + 20.40816327 + t2 = 0 + 20.40816327

Reorder the terms:
-20.40816327 + 20.40816327 + -4.075510204t + t2 = 0 + 20.40816327

Combine like terms: -20.40816327 + 20.40816327 = 0.00000000
0.00000000 + -4.075510204t + t2 = 0 + 20.40816327
-4.075510204t + t2 = 0 + 20.40816327

Combine like terms: 0 + 20.40816327 = 20.40816327
-4.075510204t + t2 = 20.40816327

The t term is -4.075510204t.  Take half its coefficient (-2.037755102).
Square it (4.152445856) and add it to both sides.

Add '4.152445856' to each side of the equation.
-4.075510204t + 4.152445856 + t2 = 20.40816327 + 4.152445856

Reorder the terms:
4.152445856 + -4.075510204t + t2 = 20.40816327 + 4.152445856

Combine like terms: 20.40816327 + 4.152445856 = 24.560609126
4.152445856 + -4.075510204t + t2 = 24.560609126

Factor a perfect square on the left side:
(t + -2.037755102)(t + -2.037755102) = 24.560609126

Calculate the square root of the right side: 4.955866133

Break this problem into two subproblems by setting 
(t + -2.037755102) equal to 4.955866133 and -4.955866133.

Subproblem 1

t + -2.037755102 = 4.955866133 Simplifying t + -2.037755102 = 4.955866133 Reorder the terms: -2.037755102 + t = 4.955866133 Solving -2.037755102 + t = 4.955866133 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.037755102' to each side of the equation. -2.037755102 + 2.037755102 + t = 4.955866133 + 2.037755102 Combine like terms: -2.037755102 + 2.037755102 = 0.000000000 0.000000000 + t = 4.955866133 + 2.037755102 t = 4.955866133 + 2.037755102 Combine like terms: 4.955866133 + 2.037755102 = 6.993621235 t = 6.993621235 Simplifying t = 6.993621235

Subproblem 2

t + -2.037755102 = -4.955866133 Simplifying t + -2.037755102 = -4.955866133 Reorder the terms: -2.037755102 + t = -4.955866133 Solving -2.037755102 + t = -4.955866133 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.037755102' to each side of the equation. -2.037755102 + 2.037755102 + t = -4.955866133 + 2.037755102 Combine like terms: -2.037755102 + 2.037755102 = 0.000000000 0.000000000 + t = -4.955866133 + 2.037755102 t = -4.955866133 + 2.037755102 Combine like terms: -4.955866133 + 2.037755102 = -2.918111031 t = -2.918111031 Simplifying t = -2.918111031

Solution

The solution to the problem is based on the solutions from the subproblems. t = {6.993621235, -2.918111031}

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