t^2-8t=5

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


Simplifying
t2 + -8t = 5

Reorder the terms:
-8t + t2 = 5

Solving
-8t + t2 = 5

Solving for variable 't'.

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

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

Begin completing the square.

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + -8t + 5 + t2 = 0 + 5

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

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

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

The t term is -8t.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8t + 16 + t2 = 5 + 16

Reorder the terms:
16 + -8t + t2 = 5 + 16

Combine like terms: 5 + 16 = 21
16 + -8t + t2 = 21

Factor a perfect square on the left side:
(t + -4)(t + -4) = 21

Calculate the square root of the right side: 4.582575695

Break this problem into two subproblems by setting 
(t + -4) equal to 4.582575695 and -4.582575695.

Subproblem 1

t + -4 = 4.582575695 Simplifying t + -4 = 4.582575695 Reorder the terms: -4 + t = 4.582575695 Solving -4 + t = 4.582575695 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + t = 4.582575695 + 4 Combine like terms: -4 + 4 = 0 0 + t = 4.582575695 + 4 t = 4.582575695 + 4 Combine like terms: 4.582575695 + 4 = 8.582575695 t = 8.582575695 Simplifying t = 8.582575695

Subproblem 2

t + -4 = -4.582575695 Simplifying t + -4 = -4.582575695 Reorder the terms: -4 + t = -4.582575695 Solving -4 + t = -4.582575695 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + t = -4.582575695 + 4 Combine like terms: -4 + 4 = 0 0 + t = -4.582575695 + 4 t = -4.582575695 + 4 Combine like terms: -4.582575695 + 4 = -0.582575695 t = -0.582575695 Simplifying t = -0.582575695

Solution

The solution to the problem is based on the solutions from the subproblems. t = {8.582575695, -0.582575695}

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