8t^2+5t-75=0

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Solution for 8t^2+5t-75=0 equation:


Simplifying
8t2 + 5t + -75 = 0

Reorder the terms:
-75 + 5t + 8t2 = 0

Solving
-75 + 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'.
-9.375 + 0.625t + t2 = 0

Move the constant term to the right:

Add '9.375' to each side of the equation.
-9.375 + 0.625t + 9.375 + t2 = 0 + 9.375

Reorder the terms:
-9.375 + 9.375 + 0.625t + t2 = 0 + 9.375

Combine like terms: -9.375 + 9.375 = 0.000
0.000 + 0.625t + t2 = 0 + 9.375
0.625t + t2 = 0 + 9.375

Combine like terms: 0 + 9.375 = 9.375
0.625t + t2 = 9.375

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 = 9.375 + 0.09765625

Reorder the terms:
0.09765625 + 0.625t + t2 = 9.375 + 0.09765625

Combine like terms: 9.375 + 0.09765625 = 9.47265625
0.09765625 + 0.625t + t2 = 9.47265625

Factor a perfect square on the left side:
(t + 0.3125)(t + 0.3125) = 9.47265625

Calculate the square root of the right side: 3.077768063

Break this problem into two subproblems by setting 
(t + 0.3125) equal to 3.077768063 and -3.077768063.

Subproblem 1

t + 0.3125 = 3.077768063 Simplifying t + 0.3125 = 3.077768063 Reorder the terms: 0.3125 + t = 3.077768063 Solving 0.3125 + t = 3.077768063 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 = 3.077768063 + -0.3125 Combine like terms: 0.3125 + -0.3125 = 0.0000 0.0000 + t = 3.077768063 + -0.3125 t = 3.077768063 + -0.3125 Combine like terms: 3.077768063 + -0.3125 = 2.765268063 t = 2.765268063 Simplifying t = 2.765268063

Subproblem 2

t + 0.3125 = -3.077768063 Simplifying t + 0.3125 = -3.077768063 Reorder the terms: 0.3125 + t = -3.077768063 Solving 0.3125 + t = -3.077768063 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 = -3.077768063 + -0.3125 Combine like terms: 0.3125 + -0.3125 = 0.0000 0.0000 + t = -3.077768063 + -0.3125 t = -3.077768063 + -0.3125 Combine like terms: -3.077768063 + -0.3125 = -3.390268063 t = -3.390268063 Simplifying t = -3.390268063

Solution

The solution to the problem is based on the solutions from the subproblems. t = {2.765268063, -3.390268063}

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