.5t^2+20t-100=0

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Solution for .5t^2+20t-100=0 equation:


Simplifying
0.5t2 + 20t + -100 = 0

Reorder the terms:
-100 + 20t + 0.5t2 = 0

Solving
-100 + 20t + 0.5t2 = 0

Solving for variable 't'.

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

Divide each side by '0.5'.
-200 + 40t + t2 = 0

Move the constant term to the right:

Add '200' to each side of the equation.
-200 + 40t + 200 + t2 = 0 + 200

Reorder the terms:
-200 + 200 + 40t + t2 = 0 + 200

Combine like terms: -200 + 200 = 0
0 + 40t + t2 = 0 + 200
40t + t2 = 0 + 200

Combine like terms: 0 + 200 = 200
40t + t2 = 200

The t term is 40t.  Take half its coefficient (20).
Square it (400) and add it to both sides.

Add '400' to each side of the equation.
40t + 400 + t2 = 200 + 400

Reorder the terms:
400 + 40t + t2 = 200 + 400

Combine like terms: 200 + 400 = 600
400 + 40t + t2 = 600

Factor a perfect square on the left side:
(t + 20)(t + 20) = 600

Calculate the square root of the right side: 24.494897428

Break this problem into two subproblems by setting 
(t + 20) equal to 24.494897428 and -24.494897428.

Subproblem 1

t + 20 = 24.494897428 Simplifying t + 20 = 24.494897428 Reorder the terms: 20 + t = 24.494897428 Solving 20 + t = 24.494897428 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + t = 24.494897428 + -20 Combine like terms: 20 + -20 = 0 0 + t = 24.494897428 + -20 t = 24.494897428 + -20 Combine like terms: 24.494897428 + -20 = 4.494897428 t = 4.494897428 Simplifying t = 4.494897428

Subproblem 2

t + 20 = -24.494897428 Simplifying t + 20 = -24.494897428 Reorder the terms: 20 + t = -24.494897428 Solving 20 + t = -24.494897428 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + t = -24.494897428 + -20 Combine like terms: 20 + -20 = 0 0 + t = -24.494897428 + -20 t = -24.494897428 + -20 Combine like terms: -24.494897428 + -20 = -44.494897428 t = -44.494897428 Simplifying t = -44.494897428

Solution

The solution to the problem is based on the solutions from the subproblems. t = {4.494897428, -44.494897428}

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