20=t^2+2t

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Solution for 20=t^2+2t equation:


Simplifying
20 = t2 + 2t

Reorder the terms:
20 = 2t + t2

Solving
20 = 2t + t2

Solving for variable 't'.

Reorder the terms:
20 + -2t + -1t2 = 2t + -2t + t2 + -1t2

Combine like terms: 2t + -2t = 0
20 + -2t + -1t2 = 0 + t2 + -1t2
20 + -2t + -1t2 = t2 + -1t2

Combine like terms: t2 + -1t2 = 0
20 + -2t + -1t2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-20 + 2t + t2 = 0

Move the constant term to the right:

Add '20' to each side of the equation.
-20 + 2t + 20 + t2 = 0 + 20

Reorder the terms:
-20 + 20 + 2t + t2 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + 2t + t2 = 0 + 20
2t + t2 = 0 + 20

Combine like terms: 0 + 20 = 20
2t + t2 = 20

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 = 20 + 1

Reorder the terms:
1 + 2t + t2 = 20 + 1

Combine like terms: 20 + 1 = 21
1 + 2t + t2 = 21

Factor a perfect square on the left side:
(t + 1)(t + 1) = 21

Calculate the square root of the right side: 4.582575695

Break this problem into two subproblems by setting 
(t + 1) equal to 4.582575695 and -4.582575695.

Subproblem 1

t + 1 = 4.582575695 Simplifying t + 1 = 4.582575695 Reorder the terms: 1 + t = 4.582575695 Solving 1 + t = 4.582575695 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 = 4.582575695 + -1 Combine like terms: 1 + -1 = 0 0 + t = 4.582575695 + -1 t = 4.582575695 + -1 Combine like terms: 4.582575695 + -1 = 3.582575695 t = 3.582575695 Simplifying t = 3.582575695

Subproblem 2

t + 1 = -4.582575695 Simplifying t + 1 = -4.582575695 Reorder the terms: 1 + t = -4.582575695 Solving 1 + t = -4.582575695 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 = -4.582575695 + -1 Combine like terms: 1 + -1 = 0 0 + t = -4.582575695 + -1 t = -4.582575695 + -1 Combine like terms: -4.582575695 + -1 = -5.582575695 t = -5.582575695 Simplifying t = -5.582575695

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.582575695, -5.582575695}

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