-.2t^2+5t-17=0

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Solution for -.2t^2+5t-17=0 equation:


Simplifying
-0.2t2 + 5t + -17 = 0

Reorder the terms:
-17 + 5t + -0.2t2 = 0

Solving
-17 + 5t + -0.2t2 = 0

Solving for variable 't'.

Begin completing the square.  Divide all terms by
-0.2 the coefficient of the squared term: 

Divide each side by '-0.2'.
85 + -25t + t2 = 0

Move the constant term to the right:

Add '-85' to each side of the equation.
85 + -25t + -85 + t2 = 0 + -85

Reorder the terms:
85 + -85 + -25t + t2 = 0 + -85

Combine like terms: 85 + -85 = 0
0 + -25t + t2 = 0 + -85
-25t + t2 = 0 + -85

Combine like terms: 0 + -85 = -85
-25t + t2 = -85

The t term is -25t.  Take half its coefficient (-12.5).
Square it (156.25) and add it to both sides.

Add '156.25' to each side of the equation.
-25t + 156.25 + t2 = -85 + 156.25

Reorder the terms:
156.25 + -25t + t2 = -85 + 156.25

Combine like terms: -85 + 156.25 = 71.25
156.25 + -25t + t2 = 71.25

Factor a perfect square on the left side:
(t + -12.5)(t + -12.5) = 71.25

Calculate the square root of the right side: 8.440971508

Break this problem into two subproblems by setting 
(t + -12.5) equal to 8.440971508 and -8.440971508.

Subproblem 1

t + -12.5 = 8.440971508 Simplifying t + -12.5 = 8.440971508 Reorder the terms: -12.5 + t = 8.440971508 Solving -12.5 + t = 8.440971508 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '12.5' to each side of the equation. -12.5 + 12.5 + t = 8.440971508 + 12.5 Combine like terms: -12.5 + 12.5 = 0.0 0.0 + t = 8.440971508 + 12.5 t = 8.440971508 + 12.5 Combine like terms: 8.440971508 + 12.5 = 20.940971508 t = 20.940971508 Simplifying t = 20.940971508

Subproblem 2

t + -12.5 = -8.440971508 Simplifying t + -12.5 = -8.440971508 Reorder the terms: -12.5 + t = -8.440971508 Solving -12.5 + t = -8.440971508 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '12.5' to each side of the equation. -12.5 + 12.5 + t = -8.440971508 + 12.5 Combine like terms: -12.5 + 12.5 = 0.0 0.0 + t = -8.440971508 + 12.5 t = -8.440971508 + 12.5 Combine like terms: -8.440971508 + 12.5 = 4.059028492 t = 4.059028492 Simplifying t = 4.059028492

Solution

The solution to the problem is based on the solutions from the subproblems. t = {20.940971508, 4.059028492}

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