187=2.8t+0.5(-.0209625668)t^2

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Solution for 187=2.8t+0.5(-.0209625668)t^2 equation:


Simplifying
187 = 2.8t + 0.5(-0.0209625668) * t2

Multiply 0.5 * -0.0209625668
187 = 2.8t + -0.0104812834t2

Solving
187 = 2.8t + -0.0104812834t2

Solving for variable 't'.

Reorder the terms:
187 + -2.8t + 0.0104812834t2 = 2.8t + -2.8t + -0.0104812834t2 + 0.0104812834t2

Combine like terms: 2.8t + -2.8t = 0.0
187 + -2.8t + 0.0104812834t2 = 0.0 + -0.0104812834t2 + 0.0104812834t2
187 + -2.8t + 0.0104812834t2 = -0.0104812834t2 + 0.0104812834t2

Combine like terms: -0.0104812834t2 + 0.0104812834t2 = 0.0000000000
187 + -2.8t + 0.0104812834t2 = 0.0000000000

Begin completing the square.  Divide all terms by
0.0104812834 the coefficient of the squared term: 

Divide each side by '0.0104812834'.
17841.32657 + -267.1428577t + t2 = 0

Move the constant term to the right:

Add '-17841.32657' to each side of the equation.
17841.32657 + -267.1428577t + -17841.32657 + t2 = 0 + -17841.32657

Reorder the terms:
17841.32657 + -17841.32657 + -267.1428577t + t2 = 0 + -17841.32657

Combine like terms: 17841.32657 + -17841.32657 = 0.00000
0.00000 + -267.1428577t + t2 = 0 + -17841.32657
-267.1428577t + t2 = 0 + -17841.32657

Combine like terms: 0 + -17841.32657 = -17841.32657
-267.1428577t + t2 = -17841.32657

The t term is -267.1428577t.  Take half its coefficient (-133.5714289).
Square it (17841.32662) and add it to both sides.

Add '17841.32662' to each side of the equation.
-267.1428577t + 17841.32662 + t2 = -17841.32657 + 17841.32662

Reorder the terms:
17841.32662 + -267.1428577t + t2 = -17841.32657 + 17841.32662

Combine like terms: -17841.32657 + 17841.32662 = 0.00005
17841.32662 + -267.1428577t + t2 = 0.00005

Factor a perfect square on the left side:
(t + -133.5714289)(t + -133.5714289) = 0.00005

Calculate the square root of the right side: 0.007071068

Break this problem into two subproblems by setting 
(t + -133.5714289) equal to 0.007071068 and -0.007071068.

Subproblem 1

t + -133.5714289 = 0.007071068 Simplifying t + -133.5714289 = 0.007071068 Reorder the terms: -133.5714289 + t = 0.007071068 Solving -133.5714289 + t = 0.007071068 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '133.5714289' to each side of the equation. -133.5714289 + 133.5714289 + t = 0.007071068 + 133.5714289 Combine like terms: -133.5714289 + 133.5714289 = 0.0000000 0.0000000 + t = 0.007071068 + 133.5714289 t = 0.007071068 + 133.5714289 Combine like terms: 0.007071068 + 133.5714289 = 133.578499968 t = 133.578499968 Simplifying t = 133.578499968

Subproblem 2

t + -133.5714289 = -0.007071068 Simplifying t + -133.5714289 = -0.007071068 Reorder the terms: -133.5714289 + t = -0.007071068 Solving -133.5714289 + t = -0.007071068 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '133.5714289' to each side of the equation. -133.5714289 + 133.5714289 + t = -0.007071068 + 133.5714289 Combine like terms: -133.5714289 + 133.5714289 = 0.0000000 0.0000000 + t = -0.007071068 + 133.5714289 t = -0.007071068 + 133.5714289 Combine like terms: -0.007071068 + 133.5714289 = 133.564357832 t = 133.564357832 Simplifying t = 133.564357832

Solution

The solution to the problem is based on the solutions from the subproblems. t = {133.578499968, 133.564357832}

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