4.905t^2-8t-30=0

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Solution for 4.905t^2-8t-30=0 equation:


Simplifying
4.905t2 + -8t + -30 = 0

Reorder the terms:
-30 + -8t + 4.905t2 = 0

Solving
-30 + -8t + 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'.
-6.116207951 + -1.630988787t + t2 = 0

Move the constant term to the right:

Add '6.116207951' to each side of the equation.
-6.116207951 + -1.630988787t + 6.116207951 + t2 = 0 + 6.116207951

Reorder the terms:
-6.116207951 + 6.116207951 + -1.630988787t + t2 = 0 + 6.116207951

Combine like terms: -6.116207951 + 6.116207951 = 0.000000000
0.000000000 + -1.630988787t + t2 = 0 + 6.116207951
-1.630988787t + t2 = 0 + 6.116207951

Combine like terms: 0 + 6.116207951 = 6.116207951
-1.630988787t + t2 = 6.116207951

The t term is -1.630988787t.  Take half its coefficient (-0.8154943935).
Square it (0.6650311058) and add it to both sides.

Add '0.6650311058' to each side of the equation.
-1.630988787t + 0.6650311058 + t2 = 6.116207951 + 0.6650311058

Reorder the terms:
0.6650311058 + -1.630988787t + t2 = 6.116207951 + 0.6650311058

Combine like terms: 6.116207951 + 0.6650311058 = 6.7812390568
0.6650311058 + -1.630988787t + t2 = 6.7812390568

Factor a perfect square on the left side:
(t + -0.8154943935)(t + -0.8154943935) = 6.7812390568

Calculate the square root of the right side: 2.604081231

Break this problem into two subproblems by setting 
(t + -0.8154943935) equal to 2.604081231 and -2.604081231.

Subproblem 1

t + -0.8154943935 = 2.604081231 Simplifying t + -0.8154943935 = 2.604081231 Reorder the terms: -0.8154943935 + t = 2.604081231 Solving -0.8154943935 + t = 2.604081231 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.8154943935' to each side of the equation. -0.8154943935 + 0.8154943935 + t = 2.604081231 + 0.8154943935 Combine like terms: -0.8154943935 + 0.8154943935 = 0.0000000000 0.0000000000 + t = 2.604081231 + 0.8154943935 t = 2.604081231 + 0.8154943935 Combine like terms: 2.604081231 + 0.8154943935 = 3.4195756245 t = 3.4195756245 Simplifying t = 3.4195756245

Subproblem 2

t + -0.8154943935 = -2.604081231 Simplifying t + -0.8154943935 = -2.604081231 Reorder the terms: -0.8154943935 + t = -2.604081231 Solving -0.8154943935 + t = -2.604081231 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.8154943935' to each side of the equation. -0.8154943935 + 0.8154943935 + t = -2.604081231 + 0.8154943935 Combine like terms: -0.8154943935 + 0.8154943935 = 0.0000000000 0.0000000000 + t = -2.604081231 + 0.8154943935 t = -2.604081231 + 0.8154943935 Combine like terms: -2.604081231 + 0.8154943935 = -1.7885868375 t = -1.7885868375 Simplifying t = -1.7885868375

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.4195756245, -1.7885868375}

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