t^2+13t=-17

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Solution for t^2+13t=-17 equation:


Simplifying
t2 + 13t = -17

Reorder the terms:
13t + t2 = -17

Solving
13t + t2 = -17

Solving for variable 't'.

Reorder the terms:
17 + 13t + t2 = -17 + 17

Combine like terms: -17 + 17 = 0
17 + 13t + t2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-17' to each side of the equation.
17 + 13t + -17 + t2 = 0 + -17

Reorder the terms:
17 + -17 + 13t + t2 = 0 + -17

Combine like terms: 17 + -17 = 0
0 + 13t + t2 = 0 + -17
13t + t2 = 0 + -17

Combine like terms: 0 + -17 = -17
13t + t2 = -17

The t term is 13t.  Take half its coefficient (6.5).
Square it (42.25) and add it to both sides.

Add '42.25' to each side of the equation.
13t + 42.25 + t2 = -17 + 42.25

Reorder the terms:
42.25 + 13t + t2 = -17 + 42.25

Combine like terms: -17 + 42.25 = 25.25
42.25 + 13t + t2 = 25.25

Factor a perfect square on the left side:
(t + 6.5)(t + 6.5) = 25.25

Calculate the square root of the right side: 5.024937811

Break this problem into two subproblems by setting 
(t + 6.5) equal to 5.024937811 and -5.024937811.

Subproblem 1

t + 6.5 = 5.024937811 Simplifying t + 6.5 = 5.024937811 Reorder the terms: 6.5 + t = 5.024937811 Solving 6.5 + t = 5.024937811 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-6.5' to each side of the equation. 6.5 + -6.5 + t = 5.024937811 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + t = 5.024937811 + -6.5 t = 5.024937811 + -6.5 Combine like terms: 5.024937811 + -6.5 = -1.475062189 t = -1.475062189 Simplifying t = -1.475062189

Subproblem 2

t + 6.5 = -5.024937811 Simplifying t + 6.5 = -5.024937811 Reorder the terms: 6.5 + t = -5.024937811 Solving 6.5 + t = -5.024937811 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-6.5' to each side of the equation. 6.5 + -6.5 + t = -5.024937811 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + t = -5.024937811 + -6.5 t = -5.024937811 + -6.5 Combine like terms: -5.024937811 + -6.5 = -11.524937811 t = -11.524937811 Simplifying t = -11.524937811

Solution

The solution to the problem is based on the solutions from the subproblems. t = {-1.475062189, -11.524937811}

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