5t^2-10t-8=0

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Solution for 5t^2-10t-8=0 equation:


Simplifying
5t2 + -10t + -8 = 0

Reorder the terms:
-8 + -10t + 5t2 = 0

Solving
-8 + -10t + 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'.
-1.6 + -2t + t2 = 0

Move the constant term to the right:

Add '1.6' to each side of the equation.
-1.6 + -2t + 1.6 + t2 = 0 + 1.6

Reorder the terms:
-1.6 + 1.6 + -2t + t2 = 0 + 1.6

Combine like terms: -1.6 + 1.6 = 0.0
0.0 + -2t + t2 = 0 + 1.6
-2t + t2 = 0 + 1.6

Combine like terms: 0 + 1.6 = 1.6
-2t + t2 = 1.6

The t term is -2t.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2t + 1 + t2 = 1.6 + 1

Reorder the terms:
1 + -2t + t2 = 1.6 + 1

Combine like terms: 1.6 + 1 = 2.6
1 + -2t + t2 = 2.6

Factor a perfect square on the left side:
(t + -1)(t + -1) = 2.6

Calculate the square root of the right side: 1.61245155

Break this problem into two subproblems by setting 
(t + -1) equal to 1.61245155 and -1.61245155.

Subproblem 1

t + -1 = 1.61245155 Simplifying t + -1 = 1.61245155 Reorder the terms: -1 + t = 1.61245155 Solving -1 + t = 1.61245155 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + t = 1.61245155 + 1 Combine like terms: -1 + 1 = 0 0 + t = 1.61245155 + 1 t = 1.61245155 + 1 Combine like terms: 1.61245155 + 1 = 2.61245155 t = 2.61245155 Simplifying t = 2.61245155

Subproblem 2

t + -1 = -1.61245155 Simplifying t + -1 = -1.61245155 Reorder the terms: -1 + t = -1.61245155 Solving -1 + t = -1.61245155 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + t = -1.61245155 + 1 Combine like terms: -1 + 1 = 0 0 + t = -1.61245155 + 1 t = -1.61245155 + 1 Combine like terms: -1.61245155 + 1 = -0.61245155 t = -0.61245155 Simplifying t = -0.61245155

Solution

The solution to the problem is based on the solutions from the subproblems. t = {2.61245155, -0.61245155}

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