t^2-2t=40-4t

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Solution for t^2-2t=40-4t equation:


Simplifying
t2 + -2t = 40 + -4t

Reorder the terms:
-2t + t2 = 40 + -4t

Solving
-2t + t2 = 40 + -4t

Solving for variable 't'.

Reorder the terms:
-40 + -2t + 4t + t2 = 40 + -4t + -40 + 4t

Combine like terms: -2t + 4t = 2t
-40 + 2t + t2 = 40 + -4t + -40 + 4t

Reorder the terms:
-40 + 2t + t2 = 40 + -40 + -4t + 4t

Combine like terms: 40 + -40 = 0
-40 + 2t + t2 = 0 + -4t + 4t
-40 + 2t + t2 = -4t + 4t

Combine like terms: -4t + 4t = 0
-40 + 2t + t2 = 0

Begin completing the square.

Move the constant term to the right:

Add '40' to each side of the equation.
-40 + 2t + 40 + t2 = 0 + 40

Reorder the terms:
-40 + 40 + 2t + t2 = 0 + 40

Combine like terms: -40 + 40 = 0
0 + 2t + t2 = 0 + 40
2t + t2 = 0 + 40

Combine like terms: 0 + 40 = 40
2t + t2 = 40

The t term is 2t.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2t + 1 + t2 = 40 + 1

Reorder the terms:
1 + 2t + t2 = 40 + 1

Combine like terms: 40 + 1 = 41
1 + 2t + t2 = 41

Factor a perfect square on the left side:
(t + 1)(t + 1) = 41

Calculate the square root of the right side: 6.403124237

Break this problem into two subproblems by setting 
(t + 1) equal to 6.403124237 and -6.403124237.

Subproblem 1

t + 1 = 6.403124237 Simplifying t + 1 = 6.403124237 Reorder the terms: 1 + t = 6.403124237 Solving 1 + t = 6.403124237 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + t = 6.403124237 + -1 Combine like terms: 1 + -1 = 0 0 + t = 6.403124237 + -1 t = 6.403124237 + -1 Combine like terms: 6.403124237 + -1 = 5.403124237 t = 5.403124237 Simplifying t = 5.403124237

Subproblem 2

t + 1 = -6.403124237 Simplifying t + 1 = -6.403124237 Reorder the terms: 1 + t = -6.403124237 Solving 1 + t = -6.403124237 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + t = -6.403124237 + -1 Combine like terms: 1 + -1 = 0 0 + t = -6.403124237 + -1 t = -6.403124237 + -1 Combine like terms: -6.403124237 + -1 = -7.403124237 t = -7.403124237 Simplifying t = -7.403124237

Solution

The solution to the problem is based on the solutions from the subproblems. t = {5.403124237, -7.403124237}

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