0=75+18.2t-4.9t^2

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Solution for 0=75+18.2t-4.9t^2 equation:


Simplifying
0 = 75 + 18.2t + -4.9t2

Solving
0 = 75 + 18.2t + -4.9t2

Solving for variable 't'.

Combine like terms: 0 + -75 = -75
-75 + -18.2t + 4.9t2 = 75 + 18.2t + -4.9t2 + -75 + -18.2t + 4.9t2

Reorder the terms:
-75 + -18.2t + 4.9t2 = 75 + -75 + 18.2t + -18.2t + -4.9t2 + 4.9t2

Combine like terms: 75 + -75 = 0
-75 + -18.2t + 4.9t2 = 0 + 18.2t + -18.2t + -4.9t2 + 4.9t2
-75 + -18.2t + 4.9t2 = 18.2t + -18.2t + -4.9t2 + 4.9t2

Combine like terms: 18.2t + -18.2t = 0.0
-75 + -18.2t + 4.9t2 = 0.0 + -4.9t2 + 4.9t2
-75 + -18.2t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
-75 + -18.2t + 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'.
-15.30612245 + -3.714285714t + t2 = 0

Move the constant term to the right:

Add '15.30612245' to each side of the equation.
-15.30612245 + -3.714285714t + 15.30612245 + t2 = 0 + 15.30612245

Reorder the terms:
-15.30612245 + 15.30612245 + -3.714285714t + t2 = 0 + 15.30612245

Combine like terms: -15.30612245 + 15.30612245 = 0.00000000
0.00000000 + -3.714285714t + t2 = 0 + 15.30612245
-3.714285714t + t2 = 0 + 15.30612245

Combine like terms: 0 + 15.30612245 = 15.30612245
-3.714285714t + t2 = 15.30612245

The t term is -3.714285714t.  Take half its coefficient (-1.857142857).
Square it (3.448979591) and add it to both sides.

Add '3.448979591' to each side of the equation.
-3.714285714t + 3.448979591 + t2 = 15.30612245 + 3.448979591

Reorder the terms:
3.448979591 + -3.714285714t + t2 = 15.30612245 + 3.448979591

Combine like terms: 15.30612245 + 3.448979591 = 18.755102041
3.448979591 + -3.714285714t + t2 = 18.755102041

Factor a perfect square on the left side:
(t + -1.857142857)(t + -1.857142857) = 18.755102041

Calculate the square root of the right side: 4.330716112

Break this problem into two subproblems by setting 
(t + -1.857142857) equal to 4.330716112 and -4.330716112.

Subproblem 1

t + -1.857142857 = 4.330716112 Simplifying t + -1.857142857 = 4.330716112 Reorder the terms: -1.857142857 + t = 4.330716112 Solving -1.857142857 + t = 4.330716112 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.857142857' to each side of the equation. -1.857142857 + 1.857142857 + t = 4.330716112 + 1.857142857 Combine like terms: -1.857142857 + 1.857142857 = 0.000000000 0.000000000 + t = 4.330716112 + 1.857142857 t = 4.330716112 + 1.857142857 Combine like terms: 4.330716112 + 1.857142857 = 6.187858969 t = 6.187858969 Simplifying t = 6.187858969

Subproblem 2

t + -1.857142857 = -4.330716112 Simplifying t + -1.857142857 = -4.330716112 Reorder the terms: -1.857142857 + t = -4.330716112 Solving -1.857142857 + t = -4.330716112 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.857142857' to each side of the equation. -1.857142857 + 1.857142857 + t = -4.330716112 + 1.857142857 Combine like terms: -1.857142857 + 1.857142857 = 0.000000000 0.000000000 + t = -4.330716112 + 1.857142857 t = -4.330716112 + 1.857142857 Combine like terms: -4.330716112 + 1.857142857 = -2.473573255 t = -2.473573255 Simplifying t = -2.473573255

Solution

The solution to the problem is based on the solutions from the subproblems. t = {6.187858969, -2.473573255}

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