4=-16t^2+25t

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


Simplifying
4 = -16t2 + 25t

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

Solving
4 = 25t + -16t2

Solving for variable 't'.

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

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

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

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

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

Move the constant term to the right:

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

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

Combine like terms: 0.25 + -0.25 = 0.00
0.00 + -1.5625t + t2 = 0 + -0.25
-1.5625t + t2 = 0 + -0.25

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

The t term is -1.5625t.  Take half its coefficient (-0.78125).
Square it (0.6103515625) and add it to both sides.

Add '0.6103515625' to each side of the equation.
-1.5625t + 0.6103515625 + t2 = -0.25 + 0.6103515625

Reorder the terms:
0.6103515625 + -1.5625t + t2 = -0.25 + 0.6103515625

Combine like terms: -0.25 + 0.6103515625 = 0.3603515625
0.6103515625 + -1.5625t + t2 = 0.3603515625

Factor a perfect square on the left side:
(t + -0.78125)(t + -0.78125) = 0.3603515625

Calculate the square root of the right side: 0.600292897

Break this problem into two subproblems by setting 
(t + -0.78125) equal to 0.600292897 and -0.600292897.

Subproblem 1

t + -0.78125 = 0.600292897 Simplifying t + -0.78125 = 0.600292897 Reorder the terms: -0.78125 + t = 0.600292897 Solving -0.78125 + t = 0.600292897 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.78125' to each side of the equation. -0.78125 + 0.78125 + t = 0.600292897 + 0.78125 Combine like terms: -0.78125 + 0.78125 = 0.00000 0.00000 + t = 0.600292897 + 0.78125 t = 0.600292897 + 0.78125 Combine like terms: 0.600292897 + 0.78125 = 1.381542897 t = 1.381542897 Simplifying t = 1.381542897

Subproblem 2

t + -0.78125 = -0.600292897 Simplifying t + -0.78125 = -0.600292897 Reorder the terms: -0.78125 + t = -0.600292897 Solving -0.78125 + t = -0.600292897 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.78125' to each side of the equation. -0.78125 + 0.78125 + t = -0.600292897 + 0.78125 Combine like terms: -0.78125 + 0.78125 = 0.00000 0.00000 + t = -0.600292897 + 0.78125 t = -0.600292897 + 0.78125 Combine like terms: -0.600292897 + 0.78125 = 0.180957103 t = 0.180957103 Simplifying t = 0.180957103

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.381542897, 0.180957103}

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