5t^2-6t-100=0

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Solution for 5t^2-6t-100=0 equation:


Simplifying
5t2 + -6t + -100 = 0

Reorder the terms:
-100 + -6t + 5t2 = 0

Solving
-100 + -6t + 5t2 = 0

Solving for variable 't'.

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

Divide each side by '5'.
-20 + -1.2t + t2 = 0

Move the constant term to the right:

Add '20' to each side of the equation.
-20 + -1.2t + 20 + t2 = 0 + 20

Reorder the terms:
-20 + 20 + -1.2t + t2 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + -1.2t + t2 = 0 + 20
-1.2t + t2 = 0 + 20

Combine like terms: 0 + 20 = 20
-1.2t + t2 = 20

The t term is -1.2t.  Take half its coefficient (-0.6).
Square it (0.36) and add it to both sides.

Add '0.36' to each side of the equation.
-1.2t + 0.36 + t2 = 20 + 0.36

Reorder the terms:
0.36 + -1.2t + t2 = 20 + 0.36

Combine like terms: 20 + 0.36 = 20.36
0.36 + -1.2t + t2 = 20.36

Factor a perfect square on the left side:
(t + -0.6)(t + -0.6) = 20.36

Calculate the square root of the right side: 4.512205669

Break this problem into two subproblems by setting 
(t + -0.6) equal to 4.512205669 and -4.512205669.

Subproblem 1

t + -0.6 = 4.512205669 Simplifying t + -0.6 = 4.512205669 Reorder the terms: -0.6 + t = 4.512205669 Solving -0.6 + t = 4.512205669 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.6' to each side of the equation. -0.6 + 0.6 + t = 4.512205669 + 0.6 Combine like terms: -0.6 + 0.6 = 0.0 0.0 + t = 4.512205669 + 0.6 t = 4.512205669 + 0.6 Combine like terms: 4.512205669 + 0.6 = 5.112205669 t = 5.112205669 Simplifying t = 5.112205669

Subproblem 2

t + -0.6 = -4.512205669 Simplifying t + -0.6 = -4.512205669 Reorder the terms: -0.6 + t = -4.512205669 Solving -0.6 + t = -4.512205669 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.6' to each side of the equation. -0.6 + 0.6 + t = -4.512205669 + 0.6 Combine like terms: -0.6 + 0.6 = 0.0 0.0 + t = -4.512205669 + 0.6 t = -4.512205669 + 0.6 Combine like terms: -4.512205669 + 0.6 = -3.912205669 t = -3.912205669 Simplifying t = -3.912205669

Solution

The solution to the problem is based on the solutions from the subproblems. t = {5.112205669, -3.912205669}

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