0=4t^2-5t-25

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Solution for 0=4t^2-5t-25 equation:


Simplifying
0 = 4t2 + -5t + -25

Reorder the terms:
0 = -25 + -5t + 4t2

Solving
0 = -25 + -5t + 4t2

Solving for variable 't'.

Combine like terms: 0 + 25 = 25
25 + 5t + -4t2 = -25 + -5t + 4t2 + 25 + 5t + -4t2

Reorder the terms:
25 + 5t + -4t2 = -25 + 25 + -5t + 5t + 4t2 + -4t2

Combine like terms: -25 + 25 = 0
25 + 5t + -4t2 = 0 + -5t + 5t + 4t2 + -4t2
25 + 5t + -4t2 = -5t + 5t + 4t2 + -4t2

Combine like terms: -5t + 5t = 0
25 + 5t + -4t2 = 0 + 4t2 + -4t2
25 + 5t + -4t2 = 4t2 + -4t2

Combine like terms: 4t2 + -4t2 = 0
25 + 5t + -4t2 = 0

Begin completing the square.  Divide all terms by
-4 the coefficient of the squared term: 

Divide each side by '-4'.
-6.25 + -1.25t + t2 = 0

Move the constant term to the right:

Add '6.25' to each side of the equation.
-6.25 + -1.25t + 6.25 + t2 = 0 + 6.25

Reorder the terms:
-6.25 + 6.25 + -1.25t + t2 = 0 + 6.25

Combine like terms: -6.25 + 6.25 = 0.00
0.00 + -1.25t + t2 = 0 + 6.25
-1.25t + t2 = 0 + 6.25

Combine like terms: 0 + 6.25 = 6.25
-1.25t + t2 = 6.25

The t term is -1.25t.  Take half its coefficient (-0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
-1.25t + 0.390625 + t2 = 6.25 + 0.390625

Reorder the terms:
0.390625 + -1.25t + t2 = 6.25 + 0.390625

Combine like terms: 6.25 + 0.390625 = 6.640625
0.390625 + -1.25t + t2 = 6.640625

Factor a perfect square on the left side:
(t + -0.625)(t + -0.625) = 6.640625

Calculate the square root of the right side: 2.576941016

Break this problem into two subproblems by setting 
(t + -0.625) equal to 2.576941016 and -2.576941016.

Subproblem 1

t + -0.625 = 2.576941016 Simplifying t + -0.625 = 2.576941016 Reorder the terms: -0.625 + t = 2.576941016 Solving -0.625 + t = 2.576941016 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + t = 2.576941016 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + t = 2.576941016 + 0.625 t = 2.576941016 + 0.625 Combine like terms: 2.576941016 + 0.625 = 3.201941016 t = 3.201941016 Simplifying t = 3.201941016

Subproblem 2

t + -0.625 = -2.576941016 Simplifying t + -0.625 = -2.576941016 Reorder the terms: -0.625 + t = -2.576941016 Solving -0.625 + t = -2.576941016 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + t = -2.576941016 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + t = -2.576941016 + 0.625 t = -2.576941016 + 0.625 Combine like terms: -2.576941016 + 0.625 = -1.951941016 t = -1.951941016 Simplifying t = -1.951941016

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.201941016, -1.951941016}

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