.85t^2+6t-1800=0

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Solution for .85t^2+6t-1800=0 equation:


Simplifying
0.85t2 + 6t + -1800 = 0

Reorder the terms:
-1800 + 6t + 0.85t2 = 0

Solving
-1800 + 6t + 0.85t2 = 0

Solving for variable 't'.

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

Divide each side by '0.85'.
-2117.647059 + 7.058823529t + t2 = 0

Move the constant term to the right:

Add '2117.647059' to each side of the equation.
-2117.647059 + 7.058823529t + 2117.647059 + t2 = 0 + 2117.647059

Reorder the terms:
-2117.647059 + 2117.647059 + 7.058823529t + t2 = 0 + 2117.647059

Combine like terms: -2117.647059 + 2117.647059 = 0.000000
0.000000 + 7.058823529t + t2 = 0 + 2117.647059
7.058823529t + t2 = 0 + 2117.647059

Combine like terms: 0 + 2117.647059 = 2117.647059
7.058823529t + t2 = 2117.647059

The t term is 7.058823529t.  Take half its coefficient (3.529411765).
Square it (12.45674741) and add it to both sides.

Add '12.45674741' to each side of the equation.
7.058823529t + 12.45674741 + t2 = 2117.647059 + 12.45674741

Reorder the terms:
12.45674741 + 7.058823529t + t2 = 2117.647059 + 12.45674741

Combine like terms: 2117.647059 + 12.45674741 = 2130.10380641
12.45674741 + 7.058823529t + t2 = 2130.10380641

Factor a perfect square on the left side:
(t + 3.529411765)(t + 3.529411765) = 2130.10380641

Calculate the square root of the right side: 46.153047639

Break this problem into two subproblems by setting 
(t + 3.529411765) equal to 46.153047639 and -46.153047639.

Subproblem 1

t + 3.529411765 = 46.153047639 Simplifying t + 3.529411765 = 46.153047639 Reorder the terms: 3.529411765 + t = 46.153047639 Solving 3.529411765 + t = 46.153047639 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-3.529411765' to each side of the equation. 3.529411765 + -3.529411765 + t = 46.153047639 + -3.529411765 Combine like terms: 3.529411765 + -3.529411765 = 0.000000000 0.000000000 + t = 46.153047639 + -3.529411765 t = 46.153047639 + -3.529411765 Combine like terms: 46.153047639 + -3.529411765 = 42.623635874 t = 42.623635874 Simplifying t = 42.623635874

Subproblem 2

t + 3.529411765 = -46.153047639 Simplifying t + 3.529411765 = -46.153047639 Reorder the terms: 3.529411765 + t = -46.153047639 Solving 3.529411765 + t = -46.153047639 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-3.529411765' to each side of the equation. 3.529411765 + -3.529411765 + t = -46.153047639 + -3.529411765 Combine like terms: 3.529411765 + -3.529411765 = 0.000000000 0.000000000 + t = -46.153047639 + -3.529411765 t = -46.153047639 + -3.529411765 Combine like terms: -46.153047639 + -3.529411765 = -49.682459404 t = -49.682459404 Simplifying t = -49.682459404

Solution

The solution to the problem is based on the solutions from the subproblems. t = {42.623635874, -49.682459404}

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