8t^2-70t-85=0

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Solution for 8t^2-70t-85=0 equation:


Simplifying
8t2 + -70t + -85 = 0

Reorder the terms:
-85 + -70t + 8t2 = 0

Solving
-85 + -70t + 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'.
-10.625 + -8.75t + t2 = 0

Move the constant term to the right:

Add '10.625' to each side of the equation.
-10.625 + -8.75t + 10.625 + t2 = 0 + 10.625

Reorder the terms:
-10.625 + 10.625 + -8.75t + t2 = 0 + 10.625

Combine like terms: -10.625 + 10.625 = 0.000
0.000 + -8.75t + t2 = 0 + 10.625
-8.75t + t2 = 0 + 10.625

Combine like terms: 0 + 10.625 = 10.625
-8.75t + t2 = 10.625

The t term is -8.75t.  Take half its coefficient (-4.375).
Square it (19.140625) and add it to both sides.

Add '19.140625' to each side of the equation.
-8.75t + 19.140625 + t2 = 10.625 + 19.140625

Reorder the terms:
19.140625 + -8.75t + t2 = 10.625 + 19.140625

Combine like terms: 10.625 + 19.140625 = 29.765625
19.140625 + -8.75t + t2 = 29.765625

Factor a perfect square on the left side:
(t + -4.375)(t + -4.375) = 29.765625

Calculate the square root of the right side: 5.455788211

Break this problem into two subproblems by setting 
(t + -4.375) equal to 5.455788211 and -5.455788211.

Subproblem 1

t + -4.375 = 5.455788211 Simplifying t + -4.375 = 5.455788211 Reorder the terms: -4.375 + t = 5.455788211 Solving -4.375 + t = 5.455788211 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '4.375' to each side of the equation. -4.375 + 4.375 + t = 5.455788211 + 4.375 Combine like terms: -4.375 + 4.375 = 0.000 0.000 + t = 5.455788211 + 4.375 t = 5.455788211 + 4.375 Combine like terms: 5.455788211 + 4.375 = 9.830788211 t = 9.830788211 Simplifying t = 9.830788211

Subproblem 2

t + -4.375 = -5.455788211 Simplifying t + -4.375 = -5.455788211 Reorder the terms: -4.375 + t = -5.455788211 Solving -4.375 + t = -5.455788211 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '4.375' to each side of the equation. -4.375 + 4.375 + t = -5.455788211 + 4.375 Combine like terms: -4.375 + 4.375 = 0.000 0.000 + t = -5.455788211 + 4.375 t = -5.455788211 + 4.375 Combine like terms: -5.455788211 + 4.375 = -1.080788211 t = -1.080788211 Simplifying t = -1.080788211

Solution

The solution to the problem is based on the solutions from the subproblems. t = {9.830788211, -1.080788211}

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