.5t^2+25t-40=0

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Solution for .5t^2+25t-40=0 equation:


Simplifying
0.5t2 + 25t + -40 = 0

Reorder the terms:
-40 + 25t + 0.5t2 = 0

Solving
-40 + 25t + 0.5t2 = 0

Solving for variable 't'.

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

Divide each side by '0.5'.
-80 + 50t + t2 = 0

Move the constant term to the right:

Add '80' to each side of the equation.
-80 + 50t + 80 + t2 = 0 + 80

Reorder the terms:
-80 + 80 + 50t + t2 = 0 + 80

Combine like terms: -80 + 80 = 0
0 + 50t + t2 = 0 + 80
50t + t2 = 0 + 80

Combine like terms: 0 + 80 = 80
50t + t2 = 80

The t term is 50t.  Take half its coefficient (25).
Square it (625) and add it to both sides.

Add '625' to each side of the equation.
50t + 625 + t2 = 80 + 625

Reorder the terms:
625 + 50t + t2 = 80 + 625

Combine like terms: 80 + 625 = 705
625 + 50t + t2 = 705

Factor a perfect square on the left side:
(t + 25)(t + 25) = 705

Calculate the square root of the right side: 26.551836095

Break this problem into two subproblems by setting 
(t + 25) equal to 26.551836095 and -26.551836095.

Subproblem 1

t + 25 = 26.551836095 Simplifying t + 25 = 26.551836095 Reorder the terms: 25 + t = 26.551836095 Solving 25 + t = 26.551836095 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-25' to each side of the equation. 25 + -25 + t = 26.551836095 + -25 Combine like terms: 25 + -25 = 0 0 + t = 26.551836095 + -25 t = 26.551836095 + -25 Combine like terms: 26.551836095 + -25 = 1.551836095 t = 1.551836095 Simplifying t = 1.551836095

Subproblem 2

t + 25 = -26.551836095 Simplifying t + 25 = -26.551836095 Reorder the terms: 25 + t = -26.551836095 Solving 25 + t = -26.551836095 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-25' to each side of the equation. 25 + -25 + t = -26.551836095 + -25 Combine like terms: 25 + -25 = 0 0 + t = -26.551836095 + -25 t = -26.551836095 + -25 Combine like terms: -26.551836095 + -25 = -51.551836095 t = -51.551836095 Simplifying t = -51.551836095

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.551836095, -51.551836095}

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