0=-2t^2+6t+3.5

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Solution for 0=-2t^2+6t+3.5 equation:


Simplifying
0 = -2t2 + 6t + 3.5

Reorder the terms:
0 = 3.5 + 6t + -2t2

Solving
0 = 3.5 + 6t + -2t2

Solving for variable 't'.

Combine like terms: 0 + -3.5 = -3.5
-3.5 + -6t + 2t2 = 3.5 + 6t + -2t2 + -3.5 + -6t + 2t2

Reorder the terms:
-3.5 + -6t + 2t2 = 3.5 + -3.5 + 6t + -6t + -2t2 + 2t2

Combine like terms: 3.5 + -3.5 = 0.0
-3.5 + -6t + 2t2 = 0.0 + 6t + -6t + -2t2 + 2t2
-3.5 + -6t + 2t2 = 6t + -6t + -2t2 + 2t2

Combine like terms: 6t + -6t = 0
-3.5 + -6t + 2t2 = 0 + -2t2 + 2t2
-3.5 + -6t + 2t2 = -2t2 + 2t2

Combine like terms: -2t2 + 2t2 = 0
-3.5 + -6t + 2t2 = 0

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

Divide each side by '2'.
-1.75 + -3t + t2 = 0

Move the constant term to the right:

Add '1.75' to each side of the equation.
-1.75 + -3t + 1.75 + t2 = 0 + 1.75

Reorder the terms:
-1.75 + 1.75 + -3t + t2 = 0 + 1.75

Combine like terms: -1.75 + 1.75 = 0.00
0.00 + -3t + t2 = 0 + 1.75
-3t + t2 = 0 + 1.75

Combine like terms: 0 + 1.75 = 1.75
-3t + t2 = 1.75

The t term is -3t.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3t + 2.25 + t2 = 1.75 + 2.25

Reorder the terms:
2.25 + -3t + t2 = 1.75 + 2.25

Combine like terms: 1.75 + 2.25 = 4
2.25 + -3t + t2 = 4

Factor a perfect square on the left side:
(t + -1.5)(t + -1.5) = 4

Calculate the square root of the right side: 2

Break this problem into two subproblems by setting 
(t + -1.5) equal to 2 and -2.

Subproblem 1

t + -1.5 = 2 Simplifying t + -1.5 = 2 Reorder the terms: -1.5 + t = 2 Solving -1.5 + t = 2 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + t = 2 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + t = 2 + 1.5 t = 2 + 1.5 Combine like terms: 2 + 1.5 = 3.5 t = 3.5 Simplifying t = 3.5

Subproblem 2

t + -1.5 = -2 Simplifying t + -1.5 = -2 Reorder the terms: -1.5 + t = -2 Solving -1.5 + t = -2 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + t = -2 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + t = -2 + 1.5 t = -2 + 1.5 Combine like terms: -2 + 1.5 = -0.5 t = -0.5 Simplifying t = -0.5

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.5, -0.5}

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