0=16t^2-40t-25

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Solution for 0=16t^2-40t-25 equation:


Simplifying
0 = 16t2 + -40t + -25

Reorder the terms:
0 = -25 + -40t + 16t2

Solving
0 = -25 + -40t + 16t2

Solving for variable 't'.

Combine like terms: 0 + 25 = 25
25 + 40t + -16t2 = -25 + -40t + 16t2 + 25 + 40t + -16t2

Reorder the terms:
25 + 40t + -16t2 = -25 + 25 + -40t + 40t + 16t2 + -16t2

Combine like terms: -25 + 25 = 0
25 + 40t + -16t2 = 0 + -40t + 40t + 16t2 + -16t2
25 + 40t + -16t2 = -40t + 40t + 16t2 + -16t2

Combine like terms: -40t + 40t = 0
25 + 40t + -16t2 = 0 + 16t2 + -16t2
25 + 40t + -16t2 = 16t2 + -16t2

Combine like terms: 16t2 + -16t2 = 0
25 + 40t + -16t2 = 0

Begin completing the square.  Divide all terms by
-16 the coefficient of the squared term: 

Divide each side by '-16'.
-1.5625 + -2.5t + t2 = 0

Move the constant term to the right:

Add '1.5625' to each side of the equation.
-1.5625 + -2.5t + 1.5625 + t2 = 0 + 1.5625

Reorder the terms:
-1.5625 + 1.5625 + -2.5t + t2 = 0 + 1.5625

Combine like terms: -1.5625 + 1.5625 = 0.0000
0.0000 + -2.5t + t2 = 0 + 1.5625
-2.5t + t2 = 0 + 1.5625

Combine like terms: 0 + 1.5625 = 1.5625
-2.5t + t2 = 1.5625

The t term is -2.5t.  Take half its coefficient (-1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
-2.5t + 1.5625 + t2 = 1.5625 + 1.5625

Reorder the terms:
1.5625 + -2.5t + t2 = 1.5625 + 1.5625

Combine like terms: 1.5625 + 1.5625 = 3.125
1.5625 + -2.5t + t2 = 3.125

Factor a perfect square on the left side:
(t + -1.25)(t + -1.25) = 3.125

Calculate the square root of the right side: 1.767766953

Break this problem into two subproblems by setting 
(t + -1.25) equal to 1.767766953 and -1.767766953.

Subproblem 1

t + -1.25 = 1.767766953 Simplifying t + -1.25 = 1.767766953 Reorder the terms: -1.25 + t = 1.767766953 Solving -1.25 + t = 1.767766953 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + t = 1.767766953 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + t = 1.767766953 + 1.25 t = 1.767766953 + 1.25 Combine like terms: 1.767766953 + 1.25 = 3.017766953 t = 3.017766953 Simplifying t = 3.017766953

Subproblem 2

t + -1.25 = -1.767766953 Simplifying t + -1.25 = -1.767766953 Reorder the terms: -1.25 + t = -1.767766953 Solving -1.25 + t = -1.767766953 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + t = -1.767766953 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + t = -1.767766953 + 1.25 t = -1.767766953 + 1.25 Combine like terms: -1.767766953 + 1.25 = -0.517766953 t = -0.517766953 Simplifying t = -0.517766953

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.017766953, -0.517766953}

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