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 = 0.582575695 t = 0.582575695 Simplifying t = 0.582575695

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 = -8.582575695 t = -8.582575695 Simplifying t = -8.582575695

Solution

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

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