-.2t^2+4t-7.2=0

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Solution for -.2t^2+4t-7.2=0 equation:


Simplifying
-0.2t2 + 4t + -7.2 = 0

Reorder the terms:
-7.2 + 4t + -0.2t2 = 0

Solving
-7.2 + 4t + -0.2t2 = 0

Solving for variable 't'.

Begin completing the square.  Divide all terms by
-0.2 the coefficient of the squared term: 

Divide each side by '-0.2'.
36 + -20t + t2 = 0

Move the constant term to the right:

Add '-36' to each side of the equation.
36 + -20t + -36 + t2 = 0 + -36

Reorder the terms:
36 + -36 + -20t + t2 = 0 + -36

Combine like terms: 36 + -36 = 0
0 + -20t + t2 = 0 + -36
-20t + t2 = 0 + -36

Combine like terms: 0 + -36 = -36
-20t + t2 = -36

The t term is -20t.  Take half its coefficient (-10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
-20t + 100 + t2 = -36 + 100

Reorder the terms:
100 + -20t + t2 = -36 + 100

Combine like terms: -36 + 100 = 64
100 + -20t + t2 = 64

Factor a perfect square on the left side:
(t + -10)(t + -10) = 64

Calculate the square root of the right side: 8

Break this problem into two subproblems by setting 
(t + -10) equal to 8 and -8.

Subproblem 1

t + -10 = 8 Simplifying t + -10 = 8 Reorder the terms: -10 + t = 8 Solving -10 + t = 8 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + t = 8 + 10 Combine like terms: -10 + 10 = 0 0 + t = 8 + 10 t = 8 + 10 Combine like terms: 8 + 10 = 18 t = 18 Simplifying t = 18

Subproblem 2

t + -10 = -8 Simplifying t + -10 = -8 Reorder the terms: -10 + t = -8 Solving -10 + t = -8 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + t = -8 + 10 Combine like terms: -10 + 10 = 0 0 + t = -8 + 10 t = -8 + 10 Combine like terms: -8 + 10 = 2 t = 2 Simplifying t = 2

Solution

The solution to the problem is based on the solutions from the subproblems. t = {18, 2}

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