4t^2+91t+5=0

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Solution for 4t^2+91t+5=0 equation:


Simplifying
4t2 + 91t + 5 = 0

Reorder the terms:
5 + 91t + 4t2 = 0

Solving
5 + 91t + 4t2 = 0

Solving for variable 't'.

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

Divide each side by '4'.
1.25 + 22.75t + t2 = 0

Move the constant term to the right:

Add '-1.25' to each side of the equation.
1.25 + 22.75t + -1.25 + t2 = 0 + -1.25

Reorder the terms:
1.25 + -1.25 + 22.75t + t2 = 0 + -1.25

Combine like terms: 1.25 + -1.25 = 0.00
0.00 + 22.75t + t2 = 0 + -1.25
22.75t + t2 = 0 + -1.25

Combine like terms: 0 + -1.25 = -1.25
22.75t + t2 = -1.25

The t term is 22.75t.  Take half its coefficient (11.375).
Square it (129.390625) and add it to both sides.

Add '129.390625' to each side of the equation.
22.75t + 129.390625 + t2 = -1.25 + 129.390625

Reorder the terms:
129.390625 + 22.75t + t2 = -1.25 + 129.390625

Combine like terms: -1.25 + 129.390625 = 128.140625
129.390625 + 22.75t + t2 = 128.140625

Factor a perfect square on the left side:
(t + 11.375)(t + 11.375) = 128.140625

Calculate the square root of the right side: 11.319921599

Break this problem into two subproblems by setting 
(t + 11.375) equal to 11.319921599 and -11.319921599.

Subproblem 1

t + 11.375 = 11.319921599 Simplifying t + 11.375 = 11.319921599 Reorder the terms: 11.375 + t = 11.319921599 Solving 11.375 + t = 11.319921599 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-11.375' to each side of the equation. 11.375 + -11.375 + t = 11.319921599 + -11.375 Combine like terms: 11.375 + -11.375 = 0.000 0.000 + t = 11.319921599 + -11.375 t = 11.319921599 + -11.375 Combine like terms: 11.319921599 + -11.375 = -0.055078401 t = -0.055078401 Simplifying t = -0.055078401

Subproblem 2

t + 11.375 = -11.319921599 Simplifying t + 11.375 = -11.319921599 Reorder the terms: 11.375 + t = -11.319921599 Solving 11.375 + t = -11.319921599 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-11.375' to each side of the equation. 11.375 + -11.375 + t = -11.319921599 + -11.375 Combine like terms: 11.375 + -11.375 = 0.000 0.000 + t = -11.319921599 + -11.375 t = -11.319921599 + -11.375 Combine like terms: -11.319921599 + -11.375 = -22.694921599 t = -22.694921599 Simplifying t = -22.694921599

Solution

The solution to the problem is based on the solutions from the subproblems. t = {-0.055078401, -22.694921599}

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