8t^2+16t+5=0

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Solution for 8t^2+16t+5=0 equation:


Simplifying
8t2 + 16t + 5 = 0

Reorder the terms:
5 + 16t + 8t2 = 0

Solving
5 + 16t + 8t2 = 0

Solving for variable 't'.

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

Divide each side by '8'.
0.625 + 2t + t2 = 0

Move the constant term to the right:

Add '-0.625' to each side of the equation.
0.625 + 2t + -0.625 + t2 = 0 + -0.625

Reorder the terms:
0.625 + -0.625 + 2t + t2 = 0 + -0.625

Combine like terms: 0.625 + -0.625 = 0.000
0.000 + 2t + t2 = 0 + -0.625
2t + t2 = 0 + -0.625

Combine like terms: 0 + -0.625 = -0.625
2t + t2 = -0.625

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 = -0.625 + 1

Reorder the terms:
1 + 2t + t2 = -0.625 + 1

Combine like terms: -0.625 + 1 = 0.375
1 + 2t + t2 = 0.375

Factor a perfect square on the left side:
(t + 1)(t + 1) = 0.375

Calculate the square root of the right side: 0.612372436

Break this problem into two subproblems by setting 
(t + 1) equal to 0.612372436 and -0.612372436.

Subproblem 1

t + 1 = 0.612372436 Simplifying t + 1 = 0.612372436 Reorder the terms: 1 + t = 0.612372436 Solving 1 + t = 0.612372436 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 = 0.612372436 + -1 Combine like terms: 1 + -1 = 0 0 + t = 0.612372436 + -1 t = 0.612372436 + -1 Combine like terms: 0.612372436 + -1 = -0.387627564 t = -0.387627564 Simplifying t = -0.387627564

Subproblem 2

t + 1 = -0.612372436 Simplifying t + 1 = -0.612372436 Reorder the terms: 1 + t = -0.612372436 Solving 1 + t = -0.612372436 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 = -0.612372436 + -1 Combine like terms: 1 + -1 = 0 0 + t = -0.612372436 + -1 t = -0.612372436 + -1 Combine like terms: -0.612372436 + -1 = -1.612372436 t = -1.612372436 Simplifying t = -1.612372436

Solution

The solution to the problem is based on the solutions from the subproblems. t = {-0.387627564, -1.612372436}

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