0=12+7.5t-5t^2

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Solution for 0=12+7.5t-5t^2 equation:


Simplifying
0 = 12 + 7.5t + -5t2

Solving
0 = 12 + 7.5t + -5t2

Solving for variable 't'.

Combine like terms: 0 + -12 = -12
-12 + -7.5t + 5t2 = 12 + 7.5t + -5t2 + -12 + -7.5t + 5t2

Reorder the terms:
-12 + -7.5t + 5t2 = 12 + -12 + 7.5t + -7.5t + -5t2 + 5t2

Combine like terms: 12 + -12 = 0
-12 + -7.5t + 5t2 = 0 + 7.5t + -7.5t + -5t2 + 5t2
-12 + -7.5t + 5t2 = 7.5t + -7.5t + -5t2 + 5t2

Combine like terms: 7.5t + -7.5t = 0.0
-12 + -7.5t + 5t2 = 0.0 + -5t2 + 5t2
-12 + -7.5t + 5t2 = -5t2 + 5t2

Combine like terms: -5t2 + 5t2 = 0
-12 + -7.5t + 5t2 = 0

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

Divide each side by '5'.
-2.4 + -1.5t + t2 = 0

Move the constant term to the right:

Add '2.4' to each side of the equation.
-2.4 + -1.5t + 2.4 + t2 = 0 + 2.4

Reorder the terms:
-2.4 + 2.4 + -1.5t + t2 = 0 + 2.4

Combine like terms: -2.4 + 2.4 = 0.0
0.0 + -1.5t + t2 = 0 + 2.4
-1.5t + t2 = 0 + 2.4

Combine like terms: 0 + 2.4 = 2.4
-1.5t + t2 = 2.4

The t term is -1.5t.  Take half its coefficient (-0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
-1.5t + 0.5625 + t2 = 2.4 + 0.5625

Reorder the terms:
0.5625 + -1.5t + t2 = 2.4 + 0.5625

Combine like terms: 2.4 + 0.5625 = 2.9625
0.5625 + -1.5t + t2 = 2.9625

Factor a perfect square on the left side:
(t + -0.75)(t + -0.75) = 2.9625

Calculate the square root of the right side: 1.721191448

Break this problem into two subproblems by setting 
(t + -0.75) equal to 1.721191448 and -1.721191448.

Subproblem 1

t + -0.75 = 1.721191448 Simplifying t + -0.75 = 1.721191448 Reorder the terms: -0.75 + t = 1.721191448 Solving -0.75 + t = 1.721191448 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + t = 1.721191448 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + t = 1.721191448 + 0.75 t = 1.721191448 + 0.75 Combine like terms: 1.721191448 + 0.75 = 2.471191448 t = 2.471191448 Simplifying t = 2.471191448

Subproblem 2

t + -0.75 = -1.721191448 Simplifying t + -0.75 = -1.721191448 Reorder the terms: -0.75 + t = -1.721191448 Solving -0.75 + t = -1.721191448 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + t = -1.721191448 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + t = -1.721191448 + 0.75 t = -1.721191448 + 0.75 Combine like terms: -1.721191448 + 0.75 = -0.971191448 t = -0.971191448 Simplifying t = -0.971191448

Solution

The solution to the problem is based on the solutions from the subproblems. t = {2.471191448, -0.971191448}

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