5t^2+9t-19=0

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Solution for 5t^2+9t-19=0 equation:


Simplifying
5t2 + 9t + -19 = 0

Reorder the terms:
-19 + 9t + 5t2 = 0

Solving
-19 + 9t + 5t2 = 0

Solving for variable 't'.

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

Divide each side by '5'.
-3.8 + 1.8t + t2 = 0

Move the constant term to the right:

Add '3.8' to each side of the equation.
-3.8 + 1.8t + 3.8 + t2 = 0 + 3.8

Reorder the terms:
-3.8 + 3.8 + 1.8t + t2 = 0 + 3.8

Combine like terms: -3.8 + 3.8 = 0.0
0.0 + 1.8t + t2 = 0 + 3.8
1.8t + t2 = 0 + 3.8

Combine like terms: 0 + 3.8 = 3.8
1.8t + t2 = 3.8

The t term is 1.8t.  Take half its coefficient (0.9).
Square it (0.81) and add it to both sides.

Add '0.81' to each side of the equation.
1.8t + 0.81 + t2 = 3.8 + 0.81

Reorder the terms:
0.81 + 1.8t + t2 = 3.8 + 0.81

Combine like terms: 3.8 + 0.81 = 4.61
0.81 + 1.8t + t2 = 4.61

Factor a perfect square on the left side:
(t + 0.9)(t + 0.9) = 4.61

Calculate the square root of the right side: 2.147091055

Break this problem into two subproblems by setting 
(t + 0.9) equal to 2.147091055 and -2.147091055.

Subproblem 1

t + 0.9 = 2.147091055 Simplifying t + 0.9 = 2.147091055 Reorder the terms: 0.9 + t = 2.147091055 Solving 0.9 + t = 2.147091055 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.9' to each side of the equation. 0.9 + -0.9 + t = 2.147091055 + -0.9 Combine like terms: 0.9 + -0.9 = 0.0 0.0 + t = 2.147091055 + -0.9 t = 2.147091055 + -0.9 Combine like terms: 2.147091055 + -0.9 = 1.247091055 t = 1.247091055 Simplifying t = 1.247091055

Subproblem 2

t + 0.9 = -2.147091055 Simplifying t + 0.9 = -2.147091055 Reorder the terms: 0.9 + t = -2.147091055 Solving 0.9 + t = -2.147091055 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.9' to each side of the equation. 0.9 + -0.9 + t = -2.147091055 + -0.9 Combine like terms: 0.9 + -0.9 = 0.0 0.0 + t = -2.147091055 + -0.9 t = -2.147091055 + -0.9 Combine like terms: -2.147091055 + -0.9 = -3.047091055 t = -3.047091055 Simplifying t = -3.047091055

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.247091055, -3.047091055}

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