8t^2-2t=5

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


Simplifying
8t2 + -2t = 5

Reorder the terms:
-2t + 8t2 = 5

Solving
-2t + 8t2 = 5

Solving for variable 't'.

Reorder the terms:
-5 + -2t + 8t2 = 5 + -5

Combine like terms: 5 + -5 = 0
-5 + -2t + 8t2 = 0

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

Divide each side by '8'.
-0.625 + -0.25t + t2 = 0

Move the constant term to the right:

Add '0.625' to each side of the equation.
-0.625 + -0.25t + 0.625 + t2 = 0 + 0.625

Reorder the terms:
-0.625 + 0.625 + -0.25t + t2 = 0 + 0.625

Combine like terms: -0.625 + 0.625 = 0.000
0.000 + -0.25t + t2 = 0 + 0.625
-0.25t + t2 = 0 + 0.625

Combine like terms: 0 + 0.625 = 0.625
-0.25t + t2 = 0.625

The t term is -0.25t.  Take half its coefficient (-0.125).
Square it (0.015625) and add it to both sides.

Add '0.015625' to each side of the equation.
-0.25t + 0.015625 + t2 = 0.625 + 0.015625

Reorder the terms:
0.015625 + -0.25t + t2 = 0.625 + 0.015625

Combine like terms: 0.625 + 0.015625 = 0.640625
0.015625 + -0.25t + t2 = 0.640625

Factor a perfect square on the left side:
(t + -0.125)(t + -0.125) = 0.640625

Calculate the square root of the right side: 0.80039053

Break this problem into two subproblems by setting 
(t + -0.125) equal to 0.80039053 and -0.80039053.

Subproblem 1

t + -0.125 = 0.80039053 Simplifying t + -0.125 = 0.80039053 Reorder the terms: -0.125 + t = 0.80039053 Solving -0.125 + t = 0.80039053 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + t = 0.80039053 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + t = 0.80039053 + 0.125 t = 0.80039053 + 0.125 Combine like terms: 0.80039053 + 0.125 = 0.92539053 t = 0.92539053 Simplifying t = 0.92539053

Subproblem 2

t + -0.125 = -0.80039053 Simplifying t + -0.125 = -0.80039053 Reorder the terms: -0.125 + t = -0.80039053 Solving -0.125 + t = -0.80039053 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + t = -0.80039053 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + t = -0.80039053 + 0.125 t = -0.80039053 + 0.125 Combine like terms: -0.80039053 + 0.125 = -0.67539053 t = -0.67539053 Simplifying t = -0.67539053

Solution

The solution to the problem is based on the solutions from the subproblems. t = {0.92539053, -0.67539053}

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