0=-.4t^2+2.4t+6.5

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Solution for 0=-.4t^2+2.4t+6.5 equation:


Simplifying
0 = -0.4t2 + 2.4t + 6.5

Reorder the terms:
0 = 6.5 + 2.4t + -0.4t2

Solving
0 = 6.5 + 2.4t + -0.4t2

Solving for variable 't'.

Combine like terms: 0 + -6.5 = -6.5
-6.5 + -2.4t + 0.4t2 = 6.5 + 2.4t + -0.4t2 + -6.5 + -2.4t + 0.4t2

Reorder the terms:
-6.5 + -2.4t + 0.4t2 = 6.5 + -6.5 + 2.4t + -2.4t + -0.4t2 + 0.4t2

Combine like terms: 6.5 + -6.5 = 0.0
-6.5 + -2.4t + 0.4t2 = 0.0 + 2.4t + -2.4t + -0.4t2 + 0.4t2
-6.5 + -2.4t + 0.4t2 = 2.4t + -2.4t + -0.4t2 + 0.4t2

Combine like terms: 2.4t + -2.4t = 0.0
-6.5 + -2.4t + 0.4t2 = 0.0 + -0.4t2 + 0.4t2
-6.5 + -2.4t + 0.4t2 = -0.4t2 + 0.4t2

Combine like terms: -0.4t2 + 0.4t2 = 0.0
-6.5 + -2.4t + 0.4t2 = 0.0

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

Divide each side by '0.4'.
-16.25 + -6t + t2 = 0

Move the constant term to the right:

Add '16.25' to each side of the equation.
-16.25 + -6t + 16.25 + t2 = 0 + 16.25

Reorder the terms:
-16.25 + 16.25 + -6t + t2 = 0 + 16.25

Combine like terms: -16.25 + 16.25 = 0.00
0.00 + -6t + t2 = 0 + 16.25
-6t + t2 = 0 + 16.25

Combine like terms: 0 + 16.25 = 16.25
-6t + t2 = 16.25

The t term is -6t.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6t + 9 + t2 = 16.25 + 9

Reorder the terms:
9 + -6t + t2 = 16.25 + 9

Combine like terms: 16.25 + 9 = 25.25
9 + -6t + t2 = 25.25

Factor a perfect square on the left side:
(t + -3)(t + -3) = 25.25

Calculate the square root of the right side: 5.024937811

Break this problem into two subproblems by setting 
(t + -3) equal to 5.024937811 and -5.024937811.

Subproblem 1

t + -3 = 5.024937811 Simplifying t + -3 = 5.024937811 Reorder the terms: -3 + t = 5.024937811 Solving -3 + t = 5.024937811 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + t = 5.024937811 + 3 Combine like terms: -3 + 3 = 0 0 + t = 5.024937811 + 3 t = 5.024937811 + 3 Combine like terms: 5.024937811 + 3 = 8.024937811 t = 8.024937811 Simplifying t = 8.024937811

Subproblem 2

t + -3 = -5.024937811 Simplifying t + -3 = -5.024937811 Reorder the terms: -3 + t = -5.024937811 Solving -3 + t = -5.024937811 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + t = -5.024937811 + 3 Combine like terms: -3 + 3 = 0 0 + t = -5.024937811 + 3 t = -5.024937811 + 3 Combine like terms: -5.024937811 + 3 = -2.024937811 t = -2.024937811 Simplifying t = -2.024937811

Solution

The solution to the problem is based on the solutions from the subproblems. t = {8.024937811, -2.024937811}

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