8t^2+4t-1=0

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Solution for 8t^2+4t-1=0 equation:


Simplifying
8t2 + 4t + -1 = 0

Reorder the terms:
-1 + 4t + 8t2 = 0

Solving
-1 + 4t + 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'.
-0.125 + 0.5t + t2 = 0

Move the constant term to the right:

Add '0.125' to each side of the equation.
-0.125 + 0.5t + 0.125 + t2 = 0 + 0.125

Reorder the terms:
-0.125 + 0.125 + 0.5t + t2 = 0 + 0.125

Combine like terms: -0.125 + 0.125 = 0.000
0.000 + 0.5t + t2 = 0 + 0.125
0.5t + t2 = 0 + 0.125

Combine like terms: 0 + 0.125 = 0.125
0.5t + t2 = 0.125

The t term is 0.5t.  Take half its coefficient (0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
0.5t + 0.0625 + t2 = 0.125 + 0.0625

Reorder the terms:
0.0625 + 0.5t + t2 = 0.125 + 0.0625

Combine like terms: 0.125 + 0.0625 = 0.1875
0.0625 + 0.5t + t2 = 0.1875

Factor a perfect square on the left side:
(t + 0.25)(t + 0.25) = 0.1875

Calculate the square root of the right side: 0.433012702

Break this problem into two subproblems by setting 
(t + 0.25) equal to 0.433012702 and -0.433012702.

Subproblem 1

t + 0.25 = 0.433012702 Simplifying t + 0.25 = 0.433012702 Reorder the terms: 0.25 + t = 0.433012702 Solving 0.25 + t = 0.433012702 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + t = 0.433012702 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + t = 0.433012702 + -0.25 t = 0.433012702 + -0.25 Combine like terms: 0.433012702 + -0.25 = 0.183012702 t = 0.183012702 Simplifying t = 0.183012702

Subproblem 2

t + 0.25 = -0.433012702 Simplifying t + 0.25 = -0.433012702 Reorder the terms: 0.25 + t = -0.433012702 Solving 0.25 + t = -0.433012702 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + t = -0.433012702 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + t = -0.433012702 + -0.25 t = -0.433012702 + -0.25 Combine like terms: -0.433012702 + -0.25 = -0.683012702 t = -0.683012702 Simplifying t = -0.683012702

Solution

The solution to the problem is based on the solutions from the subproblems. t = {0.183012702, -0.683012702}

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