-.8t^2+14.4t+2=0

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Solution for -.8t^2+14.4t+2=0 equation:


Simplifying
-0.8t2 + 14.4t + 2 = 0

Reorder the terms:
2 + 14.4t + -0.8t2 = 0

Solving
2 + 14.4t + -0.8t2 = 0

Solving for variable 't'.

Begin completing the square.  Divide all terms by
-0.8 the coefficient of the squared term: 

Divide each side by '-0.8'.
-2.5 + -18t + t2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + -18t + 2.5 + t2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + -18t + t2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + -18t + t2 = 0 + 2.5
-18t + t2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
-18t + t2 = 2.5

The t term is -18t.  Take half its coefficient (-9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
-18t + 81 + t2 = 2.5 + 81

Reorder the terms:
81 + -18t + t2 = 2.5 + 81

Combine like terms: 2.5 + 81 = 83.5
81 + -18t + t2 = 83.5

Factor a perfect square on the left side:
(t + -9)(t + -9) = 83.5

Calculate the square root of the right side: 9.137833441

Break this problem into two subproblems by setting 
(t + -9) equal to 9.137833441 and -9.137833441.

Subproblem 1

t + -9 = 9.137833441 Simplifying t + -9 = 9.137833441 Reorder the terms: -9 + t = 9.137833441 Solving -9 + t = 9.137833441 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + t = 9.137833441 + 9 Combine like terms: -9 + 9 = 0 0 + t = 9.137833441 + 9 t = 9.137833441 + 9 Combine like terms: 9.137833441 + 9 = 18.137833441 t = 18.137833441 Simplifying t = 18.137833441

Subproblem 2

t + -9 = -9.137833441 Simplifying t + -9 = -9.137833441 Reorder the terms: -9 + t = -9.137833441 Solving -9 + t = -9.137833441 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + t = -9.137833441 + 9 Combine like terms: -9 + 9 = 0 0 + t = -9.137833441 + 9 t = -9.137833441 + 9 Combine like terms: -9.137833441 + 9 = -0.137833441 t = -0.137833441 Simplifying t = -0.137833441

Solution

The solution to the problem is based on the solutions from the subproblems. t = {18.137833441, -0.137833441}

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