295=28t-0.4t^2

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Solution for 295=28t-0.4t^2 equation:


Simplifying
295 = 28t + -0.4t2

Solving
295 = 28t + -0.4t2

Solving for variable 't'.

Reorder the terms:
295 + -28t + 0.4t2 = 28t + -28t + -0.4t2 + 0.4t2

Combine like terms: 28t + -28t = 0
295 + -28t + 0.4t2 = 0 + -0.4t2 + 0.4t2
295 + -28t + 0.4t2 = -0.4t2 + 0.4t2

Combine like terms: -0.4t2 + 0.4t2 = 0.0
295 + -28t + 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'.
737.5 + -70t + t2 = 0

Move the constant term to the right:

Add '-737.5' to each side of the equation.
737.5 + -70t + -737.5 + t2 = 0 + -737.5

Reorder the terms:
737.5 + -737.5 + -70t + t2 = 0 + -737.5

Combine like terms: 737.5 + -737.5 = 0.0
0.0 + -70t + t2 = 0 + -737.5
-70t + t2 = 0 + -737.5

Combine like terms: 0 + -737.5 = -737.5
-70t + t2 = -737.5

The t term is -70t.  Take half its coefficient (-35).
Square it (1225) and add it to both sides.

Add '1225' to each side of the equation.
-70t + 1225 + t2 = -737.5 + 1225

Reorder the terms:
1225 + -70t + t2 = -737.5 + 1225

Combine like terms: -737.5 + 1225 = 487.5
1225 + -70t + t2 = 487.5

Factor a perfect square on the left side:
(t + -35)(t + -35) = 487.5

Calculate the square root of the right side: 22.079402166

Break this problem into two subproblems by setting 
(t + -35) equal to 22.079402166 and -22.079402166.

Subproblem 1

t + -35 = 22.079402166 Simplifying t + -35 = 22.079402166 Reorder the terms: -35 + t = 22.079402166 Solving -35 + t = 22.079402166 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '35' to each side of the equation. -35 + 35 + t = 22.079402166 + 35 Combine like terms: -35 + 35 = 0 0 + t = 22.079402166 + 35 t = 22.079402166 + 35 Combine like terms: 22.079402166 + 35 = 57.079402166 t = 57.079402166 Simplifying t = 57.079402166

Subproblem 2

t + -35 = -22.079402166 Simplifying t + -35 = -22.079402166 Reorder the terms: -35 + t = -22.079402166 Solving -35 + t = -22.079402166 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '35' to each side of the equation. -35 + 35 + t = -22.079402166 + 35 Combine like terms: -35 + 35 = 0 0 + t = -22.079402166 + 35 t = -22.079402166 + 35 Combine like terms: -22.079402166 + 35 = 12.920597834 t = 12.920597834 Simplifying t = 12.920597834

Solution

The solution to the problem is based on the solutions from the subproblems. t = {57.079402166, 12.920597834}

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