0=-5t^2+12t-7.2

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Solution for 0=-5t^2+12t-7.2 equation:


Simplifying
0 = -5t2 + 12t + -7.2

Reorder the terms:
0 = -7.2 + 12t + -5t2

Solving
0 = -7.2 + 12t + -5t2

Solving for variable 't'.

Combine like terms: 0 + 7.2 = 7.2
7.2 + -12t + 5t2 = -7.2 + 12t + -5t2 + 7.2 + -12t + 5t2

Reorder the terms:
7.2 + -12t + 5t2 = -7.2 + 7.2 + 12t + -12t + -5t2 + 5t2

Combine like terms: -7.2 + 7.2 = 0.0
7.2 + -12t + 5t2 = 0.0 + 12t + -12t + -5t2 + 5t2
7.2 + -12t + 5t2 = 12t + -12t + -5t2 + 5t2

Combine like terms: 12t + -12t = 0
7.2 + -12t + 5t2 = 0 + -5t2 + 5t2
7.2 + -12t + 5t2 = -5t2 + 5t2

Combine like terms: -5t2 + 5t2 = 0
7.2 + -12t + 5t2 = 0

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

Divide each side by '5'.
1.44 + -2.4t + t2 = 0

Move the constant term to the right:

Add '-1.44' to each side of the equation.
1.44 + -2.4t + -1.44 + t2 = 0 + -1.44

Reorder the terms:
1.44 + -1.44 + -2.4t + t2 = 0 + -1.44

Combine like terms: 1.44 + -1.44 = 0.00
0.00 + -2.4t + t2 = 0 + -1.44
-2.4t + t2 = 0 + -1.44

Combine like terms: 0 + -1.44 = -1.44
-2.4t + t2 = -1.44

The t term is -2.4t.  Take half its coefficient (-1.2).
Square it (1.44) and add it to both sides.

Add '1.44' to each side of the equation.
-2.4t + 1.44 + t2 = -1.44 + 1.44

Reorder the terms:
1.44 + -2.4t + t2 = -1.44 + 1.44

Combine like terms: -1.44 + 1.44 = 0.00
1.44 + -2.4t + t2 = 0.00

Factor a perfect square on the left side:
(t + -1.2)(t + -1.2) = 0.00

Calculate the square root of the right side: 0.00

Break this problem into two subproblems by setting 
(t + -1.2) equal to 0.00 and 0.00.

Subproblem 1

t + -1.2 = 0.00 Simplifying t + -1.2 = 0.00 Reorder the terms: -1.2 + t = 0.00 Solving -1.2 + t = 0.00 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.2' to each side of the equation. -1.2 + 1.2 + t = 0.00 + 1.2 Combine like terms: -1.2 + 1.2 = 0.0 0.0 + t = 0.00 + 1.2 t = 0.00 + 1.2 Combine like terms: 0.00 + 1.2 = 1.2 t = 1.2 Simplifying t = 1.2

Subproblem 2

t + -1.2 = 0.00 Simplifying t + -1.2 = 0.00 Reorder the terms: -1.2 + t = 0.00 Solving -1.2 + t = 0.00 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.2' to each side of the equation. -1.2 + 1.2 + t = 0.00 + 1.2 Combine like terms: -1.2 + 1.2 = 0.0 0.0 + t = 0.00 + 1.2 t = 0.00 + 1.2 Combine like terms: 0.00 + 1.2 = 1.2 t = 1.2 Simplifying t = 1.2

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.2, 1.2}

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