400=.5t^2+5t

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Solution for 400=.5t^2+5t equation:


Simplifying
400 = 0.5t2 + 5t

Reorder the terms:
400 = 5t + 0.5t2

Solving
400 = 5t + 0.5t2

Solving for variable 't'.

Reorder the terms:
400 + -5t + -0.5t2 = 5t + -5t + 0.5t2 + -0.5t2

Combine like terms: 5t + -5t = 0
400 + -5t + -0.5t2 = 0 + 0.5t2 + -0.5t2
400 + -5t + -0.5t2 = 0.5t2 + -0.5t2

Combine like terms: 0.5t2 + -0.5t2 = 0.0
400 + -5t + -0.5t2 = 0.0

Begin completing the square.  Divide all terms by
-0.5 the coefficient of the squared term: 

Divide each side by '-0.5'.
-800 + 10t + t2 = 0

Move the constant term to the right:

Add '800' to each side of the equation.
-800 + 10t + 800 + t2 = 0 + 800

Reorder the terms:
-800 + 800 + 10t + t2 = 0 + 800

Combine like terms: -800 + 800 = 0
0 + 10t + t2 = 0 + 800
10t + t2 = 0 + 800

Combine like terms: 0 + 800 = 800
10t + t2 = 800

The t term is 10t.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10t + 25 + t2 = 800 + 25

Reorder the terms:
25 + 10t + t2 = 800 + 25

Combine like terms: 800 + 25 = 825
25 + 10t + t2 = 825

Factor a perfect square on the left side:
(t + 5)(t + 5) = 825

Calculate the square root of the right side: 28.722813233

Break this problem into two subproblems by setting 
(t + 5) equal to 28.722813233 and -28.722813233.

Subproblem 1

t + 5 = 28.722813233 Simplifying t + 5 = 28.722813233 Reorder the terms: 5 + t = 28.722813233 Solving 5 + t = 28.722813233 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + t = 28.722813233 + -5 Combine like terms: 5 + -5 = 0 0 + t = 28.722813233 + -5 t = 28.722813233 + -5 Combine like terms: 28.722813233 + -5 = 23.722813233 t = 23.722813233 Simplifying t = 23.722813233

Subproblem 2

t + 5 = -28.722813233 Simplifying t + 5 = -28.722813233 Reorder the terms: 5 + t = -28.722813233 Solving 5 + t = -28.722813233 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + t = -28.722813233 + -5 Combine like terms: 5 + -5 = 0 0 + t = -28.722813233 + -5 t = -28.722813233 + -5 Combine like terms: -28.722813233 + -5 = -33.722813233 t = -33.722813233 Simplifying t = -33.722813233

Solution

The solution to the problem is based on the solutions from the subproblems. t = {23.722813233, -33.722813233}

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