0=-16t^2+4t+25

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Solution for 0=-16t^2+4t+25 equation:


Simplifying
0 = -16t2 + 4t + 25

Reorder the terms:
0 = 25 + 4t + -16t2

Solving
0 = 25 + 4t + -16t2

Solving for variable 't'.

Combine like terms: 0 + -25 = -25
-25 + -4t + 16t2 = 25 + 4t + -16t2 + -25 + -4t + 16t2

Reorder the terms:
-25 + -4t + 16t2 = 25 + -25 + 4t + -4t + -16t2 + 16t2

Combine like terms: 25 + -25 = 0
-25 + -4t + 16t2 = 0 + 4t + -4t + -16t2 + 16t2
-25 + -4t + 16t2 = 4t + -4t + -16t2 + 16t2

Combine like terms: 4t + -4t = 0
-25 + -4t + 16t2 = 0 + -16t2 + 16t2
-25 + -4t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
-25 + -4t + 16t2 = 0

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

Divide each side by '16'.
-1.5625 + -0.25t + t2 = 0

Move the constant term to the right:

Add '1.5625' to each side of the equation.
-1.5625 + -0.25t + 1.5625 + t2 = 0 + 1.5625

Reorder the terms:
-1.5625 + 1.5625 + -0.25t + t2 = 0 + 1.5625

Combine like terms: -1.5625 + 1.5625 = 0.0000
0.0000 + -0.25t + t2 = 0 + 1.5625
-0.25t + t2 = 0 + 1.5625

Combine like terms: 0 + 1.5625 = 1.5625
-0.25t + t2 = 1.5625

The t term is -0.25t.  Take half its coefficient (-0.125).
Square it (0.015625) and add it to both sides.

Add '0.015625' to each side of the equation.
-0.25t + 0.015625 + t2 = 1.5625 + 0.015625

Reorder the terms:
0.015625 + -0.25t + t2 = 1.5625 + 0.015625

Combine like terms: 1.5625 + 0.015625 = 1.578125
0.015625 + -0.25t + t2 = 1.578125

Factor a perfect square on the left side:
(t + -0.125)(t + -0.125) = 1.578125

Calculate the square root of the right side: 1.256234453

Break this problem into two subproblems by setting 
(t + -0.125) equal to 1.256234453 and -1.256234453.

Subproblem 1

t + -0.125 = 1.256234453 Simplifying t + -0.125 = 1.256234453 Reorder the terms: -0.125 + t = 1.256234453 Solving -0.125 + t = 1.256234453 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + t = 1.256234453 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + t = 1.256234453 + 0.125 t = 1.256234453 + 0.125 Combine like terms: 1.256234453 + 0.125 = 1.381234453 t = 1.381234453 Simplifying t = 1.381234453

Subproblem 2

t + -0.125 = -1.256234453 Simplifying t + -0.125 = -1.256234453 Reorder the terms: -0.125 + t = -1.256234453 Solving -0.125 + t = -1.256234453 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + t = -1.256234453 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + t = -1.256234453 + 0.125 t = -1.256234453 + 0.125 Combine like terms: -1.256234453 + 0.125 = -1.131234453 t = -1.131234453 Simplifying t = -1.131234453

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.381234453, -1.131234453}

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