12=t^2+2t

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Solution for 12=t^2+2t equation:


Simplifying
12 = t2 + 2t

Reorder the terms:
12 = 2t + t2

Solving
12 = 2t + t2

Solving for variable 't'.

Reorder the terms:
12 + -2t + -1t2 = 2t + -2t + t2 + -1t2

Combine like terms: 2t + -2t = 0
12 + -2t + -1t2 = 0 + t2 + -1t2
12 + -2t + -1t2 = t2 + -1t2

Combine like terms: t2 + -1t2 = 0
12 + -2t + -1t2 = 0

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

Divide each side by '-1'.
-12 + 2t + t2 = 0

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + 2t + 12 + t2 = 0 + 12

Reorder the terms:
-12 + 12 + 2t + t2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + 2t + t2 = 0 + 12
2t + t2 = 0 + 12

Combine like terms: 0 + 12 = 12
2t + t2 = 12

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 = 12 + 1

Reorder the terms:
1 + 2t + t2 = 12 + 1

Combine like terms: 12 + 1 = 13
1 + 2t + t2 = 13

Factor a perfect square on the left side:
(t + 1)(t + 1) = 13

Calculate the square root of the right side: 3.605551275

Break this problem into two subproblems by setting 
(t + 1) equal to 3.605551275 and -3.605551275.

Subproblem 1

t + 1 = 3.605551275 Simplifying t + 1 = 3.605551275 Reorder the terms: 1 + t = 3.605551275 Solving 1 + t = 3.605551275 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 = 3.605551275 + -1 Combine like terms: 1 + -1 = 0 0 + t = 3.605551275 + -1 t = 3.605551275 + -1 Combine like terms: 3.605551275 + -1 = 2.605551275 t = 2.605551275 Simplifying t = 2.605551275

Subproblem 2

t + 1 = -3.605551275 Simplifying t + 1 = -3.605551275 Reorder the terms: 1 + t = -3.605551275 Solving 1 + t = -3.605551275 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 = -3.605551275 + -1 Combine like terms: 1 + -1 = 0 0 + t = -3.605551275 + -1 t = -3.605551275 + -1 Combine like terms: -3.605551275 + -1 = -4.605551275 t = -4.605551275 Simplifying t = -4.605551275

Solution

The solution to the problem is based on the solutions from the subproblems. t = {2.605551275, -4.605551275}

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