8t^2-5t-25=0

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Solution for 8t^2-5t-25=0 equation:


Simplifying
8t2 + -5t + -25 = 0

Reorder the terms:
-25 + -5t + 8t2 = 0

Solving
-25 + -5t + 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'.
-3.125 + -0.625t + t2 = 0

Move the constant term to the right:

Add '3.125' to each side of the equation.
-3.125 + -0.625t + 3.125 + t2 = 0 + 3.125

Reorder the terms:
-3.125 + 3.125 + -0.625t + t2 = 0 + 3.125

Combine like terms: -3.125 + 3.125 = 0.000
0.000 + -0.625t + t2 = 0 + 3.125
-0.625t + t2 = 0 + 3.125

Combine like terms: 0 + 3.125 = 3.125
-0.625t + t2 = 3.125

The t term is -0.625t.  Take half its coefficient (-0.3125).
Square it (0.09765625) and add it to both sides.

Add '0.09765625' to each side of the equation.
-0.625t + 0.09765625 + t2 = 3.125 + 0.09765625

Reorder the terms:
0.09765625 + -0.625t + t2 = 3.125 + 0.09765625

Combine like terms: 3.125 + 0.09765625 = 3.22265625
0.09765625 + -0.625t + t2 = 3.22265625

Factor a perfect square on the left side:
(t + -0.3125)(t + -0.3125) = 3.22265625

Calculate the square root of the right side: 1.795175827

Break this problem into two subproblems by setting 
(t + -0.3125) equal to 1.795175827 and -1.795175827.

Subproblem 1

t + -0.3125 = 1.795175827 Simplifying t + -0.3125 = 1.795175827 Reorder the terms: -0.3125 + t = 1.795175827 Solving -0.3125 + t = 1.795175827 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.3125' to each side of the equation. -0.3125 + 0.3125 + t = 1.795175827 + 0.3125 Combine like terms: -0.3125 + 0.3125 = 0.0000 0.0000 + t = 1.795175827 + 0.3125 t = 1.795175827 + 0.3125 Combine like terms: 1.795175827 + 0.3125 = 2.107675827 t = 2.107675827 Simplifying t = 2.107675827

Subproblem 2

t + -0.3125 = -1.795175827 Simplifying t + -0.3125 = -1.795175827 Reorder the terms: -0.3125 + t = -1.795175827 Solving -0.3125 + t = -1.795175827 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.3125' to each side of the equation. -0.3125 + 0.3125 + t = -1.795175827 + 0.3125 Combine like terms: -0.3125 + 0.3125 = 0.0000 0.0000 + t = -1.795175827 + 0.3125 t = -1.795175827 + 0.3125 Combine like terms: -1.795175827 + 0.3125 = -1.482675827 t = -1.482675827 Simplifying t = -1.482675827

Solution

The solution to the problem is based on the solutions from the subproblems. t = {2.107675827, -1.482675827}

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