0=0.04t^2+2t-200

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Solution for 0=0.04t^2+2t-200 equation:


Simplifying
0 = 0.04t2 + 2t + -200

Reorder the terms:
0 = -200 + 2t + 0.04t2

Solving
0 = -200 + 2t + 0.04t2

Solving for variable 't'.

Combine like terms: 0 + 200 = 200
200 + -2t + -0.04t2 = -200 + 2t + 0.04t2 + 200 + -2t + -0.04t2

Reorder the terms:
200 + -2t + -0.04t2 = -200 + 200 + 2t + -2t + 0.04t2 + -0.04t2

Combine like terms: -200 + 200 = 0
200 + -2t + -0.04t2 = 0 + 2t + -2t + 0.04t2 + -0.04t2
200 + -2t + -0.04t2 = 2t + -2t + 0.04t2 + -0.04t2

Combine like terms: 2t + -2t = 0
200 + -2t + -0.04t2 = 0 + 0.04t2 + -0.04t2
200 + -2t + -0.04t2 = 0.04t2 + -0.04t2

Combine like terms: 0.04t2 + -0.04t2 = 0.00
200 + -2t + -0.04t2 = 0.00

Begin completing the square.  Divide all terms by
-0.04 the coefficient of the squared term: 

Divide each side by '-0.04'.
-5000 + 50t + t2 = 0

Move the constant term to the right:

Add '5000' to each side of the equation.
-5000 + 50t + 5000 + t2 = 0 + 5000

Reorder the terms:
-5000 + 5000 + 50t + t2 = 0 + 5000

Combine like terms: -5000 + 5000 = 0
0 + 50t + t2 = 0 + 5000
50t + t2 = 0 + 5000

Combine like terms: 0 + 5000 = 5000
50t + t2 = 5000

The t term is 50t.  Take half its coefficient (25).
Square it (625) and add it to both sides.

Add '625' to each side of the equation.
50t + 625 + t2 = 5000 + 625

Reorder the terms:
625 + 50t + t2 = 5000 + 625

Combine like terms: 5000 + 625 = 5625
625 + 50t + t2 = 5625

Factor a perfect square on the left side:
(t + 25)(t + 25) = 5625

Calculate the square root of the right side: 75

Break this problem into two subproblems by setting 
(t + 25) equal to 75 and -75.

Subproblem 1

t + 25 = 75 Simplifying t + 25 = 75 Reorder the terms: 25 + t = 75 Solving 25 + t = 75 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-25' to each side of the equation. 25 + -25 + t = 75 + -25 Combine like terms: 25 + -25 = 0 0 + t = 75 + -25 t = 75 + -25 Combine like terms: 75 + -25 = 50 t = 50 Simplifying t = 50

Subproblem 2

t + 25 = -75 Simplifying t + 25 = -75 Reorder the terms: 25 + t = -75 Solving 25 + t = -75 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-25' to each side of the equation. 25 + -25 + t = -75 + -25 Combine like terms: 25 + -25 = 0 0 + t = -75 + -25 t = -75 + -25 Combine like terms: -75 + -25 = -100 t = -100 Simplifying t = -100

Solution

The solution to the problem is based on the solutions from the subproblems. t = {50, -100}

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