185=2.5t^2-50t-187.5

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Solution for 185=2.5t^2-50t-187.5 equation:


Simplifying
185 = 2.5t2 + -50t + -187.5

Reorder the terms:
185 = -187.5 + -50t + 2.5t2

Solving
185 = -187.5 + -50t + 2.5t2

Solving for variable 't'.

Combine like terms: 185 + 187.5 = 372.5
372.5 + 50t + -2.5t2 = -187.5 + -50t + 2.5t2 + 187.5 + 50t + -2.5t2

Reorder the terms:
372.5 + 50t + -2.5t2 = -187.5 + 187.5 + -50t + 50t + 2.5t2 + -2.5t2

Combine like terms: -187.5 + 187.5 = 0.0
372.5 + 50t + -2.5t2 = 0.0 + -50t + 50t + 2.5t2 + -2.5t2
372.5 + 50t + -2.5t2 = -50t + 50t + 2.5t2 + -2.5t2

Combine like terms: -50t + 50t = 0
372.5 + 50t + -2.5t2 = 0 + 2.5t2 + -2.5t2
372.5 + 50t + -2.5t2 = 2.5t2 + -2.5t2

Combine like terms: 2.5t2 + -2.5t2 = 0.0
372.5 + 50t + -2.5t2 = 0.0

Begin completing the square.  Divide all terms by
-2.5 the coefficient of the squared term: 

Divide each side by '-2.5'.
-149 + -20t + t2 = 0

Move the constant term to the right:

Add '149' to each side of the equation.
-149 + -20t + 149 + t2 = 0 + 149

Reorder the terms:
-149 + 149 + -20t + t2 = 0 + 149

Combine like terms: -149 + 149 = 0
0 + -20t + t2 = 0 + 149
-20t + t2 = 0 + 149

Combine like terms: 0 + 149 = 149
-20t + t2 = 149

The t term is -20t.  Take half its coefficient (-10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
-20t + 100 + t2 = 149 + 100

Reorder the terms:
100 + -20t + t2 = 149 + 100

Combine like terms: 149 + 100 = 249
100 + -20t + t2 = 249

Factor a perfect square on the left side:
(t + -10)(t + -10) = 249

Calculate the square root of the right side: 15.779733838

Break this problem into two subproblems by setting 
(t + -10) equal to 15.779733838 and -15.779733838.

Subproblem 1

t + -10 = 15.779733838 Simplifying t + -10 = 15.779733838 Reorder the terms: -10 + t = 15.779733838 Solving -10 + t = 15.779733838 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + t = 15.779733838 + 10 Combine like terms: -10 + 10 = 0 0 + t = 15.779733838 + 10 t = 15.779733838 + 10 Combine like terms: 15.779733838 + 10 = 25.779733838 t = 25.779733838 Simplifying t = 25.779733838

Subproblem 2

t + -10 = -15.779733838 Simplifying t + -10 = -15.779733838 Reorder the terms: -10 + t = -15.779733838 Solving -10 + t = -15.779733838 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + t = -15.779733838 + 10 Combine like terms: -10 + 10 = 0 0 + t = -15.779733838 + 10 t = -15.779733838 + 10 Combine like terms: -15.779733838 + 10 = -5.779733838 t = -5.779733838 Simplifying t = -5.779733838

Solution

The solution to the problem is based on the solutions from the subproblems. t = {25.779733838, -5.779733838}

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