8=t^2+5t

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Solution for 8=t^2+5t equation:


Simplifying
8 = t2 + 5t

Reorder the terms:
8 = 5t + t2

Solving
8 = 5t + t2

Solving for variable 't'.

Reorder the terms:
8 + -5t + -1t2 = 5t + -5t + t2 + -1t2

Combine like terms: 5t + -5t = 0
8 + -5t + -1t2 = 0 + t2 + -1t2
8 + -5t + -1t2 = t2 + -1t2

Combine like terms: t2 + -1t2 = 0
8 + -5t + -1t2 = 0

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

Divide each side by '-1'.
-8 + 5t + t2 = 0

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + 5t + 8 + t2 = 0 + 8

Reorder the terms:
-8 + 8 + 5t + t2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + 5t + t2 = 0 + 8
5t + t2 = 0 + 8

Combine like terms: 0 + 8 = 8
5t + t2 = 8

The t term is 5t.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5t + 6.25 + t2 = 8 + 6.25

Reorder the terms:
6.25 + 5t + t2 = 8 + 6.25

Combine like terms: 8 + 6.25 = 14.25
6.25 + 5t + t2 = 14.25

Factor a perfect square on the left side:
(t + 2.5)(t + 2.5) = 14.25

Calculate the square root of the right side: 3.774917218

Break this problem into two subproblems by setting 
(t + 2.5) equal to 3.774917218 and -3.774917218.

Subproblem 1

t + 2.5 = 3.774917218 Simplifying t + 2.5 = 3.774917218 Reorder the terms: 2.5 + t = 3.774917218 Solving 2.5 + t = 3.774917218 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + t = 3.774917218 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + t = 3.774917218 + -2.5 t = 3.774917218 + -2.5 Combine like terms: 3.774917218 + -2.5 = 1.274917218 t = 1.274917218 Simplifying t = 1.274917218

Subproblem 2

t + 2.5 = -3.774917218 Simplifying t + 2.5 = -3.774917218 Reorder the terms: 2.5 + t = -3.774917218 Solving 2.5 + t = -3.774917218 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + t = -3.774917218 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + t = -3.774917218 + -2.5 t = -3.774917218 + -2.5 Combine like terms: -3.774917218 + -2.5 = -6.274917218 t = -6.274917218 Simplifying t = -6.274917218

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.274917218, -6.274917218}

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