5t^2+17t-18=0

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Solution for 5t^2+17t-18=0 equation:


Simplifying
5t2 + 17t + -18 = 0

Reorder the terms:
-18 + 17t + 5t2 = 0

Solving
-18 + 17t + 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'.
-3.6 + 3.4t + t2 = 0

Move the constant term to the right:

Add '3.6' to each side of the equation.
-3.6 + 3.4t + 3.6 + t2 = 0 + 3.6

Reorder the terms:
-3.6 + 3.6 + 3.4t + t2 = 0 + 3.6

Combine like terms: -3.6 + 3.6 = 0.0
0.0 + 3.4t + t2 = 0 + 3.6
3.4t + t2 = 0 + 3.6

Combine like terms: 0 + 3.6 = 3.6
3.4t + t2 = 3.6

The t term is 3.4t.  Take half its coefficient (1.7).
Square it (2.89) and add it to both sides.

Add '2.89' to each side of the equation.
3.4t + 2.89 + t2 = 3.6 + 2.89

Reorder the terms:
2.89 + 3.4t + t2 = 3.6 + 2.89

Combine like terms: 3.6 + 2.89 = 6.49
2.89 + 3.4t + t2 = 6.49

Factor a perfect square on the left side:
(t + 1.7)(t + 1.7) = 6.49

Calculate the square root of the right side: 2.547547841

Break this problem into two subproblems by setting 
(t + 1.7) equal to 2.547547841 and -2.547547841.

Subproblem 1

t + 1.7 = 2.547547841 Simplifying t + 1.7 = 2.547547841 Reorder the terms: 1.7 + t = 2.547547841 Solving 1.7 + t = 2.547547841 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-1.7' to each side of the equation. 1.7 + -1.7 + t = 2.547547841 + -1.7 Combine like terms: 1.7 + -1.7 = 0.0 0.0 + t = 2.547547841 + -1.7 t = 2.547547841 + -1.7 Combine like terms: 2.547547841 + -1.7 = 0.847547841 t = 0.847547841 Simplifying t = 0.847547841

Subproblem 2

t + 1.7 = -2.547547841 Simplifying t + 1.7 = -2.547547841 Reorder the terms: 1.7 + t = -2.547547841 Solving 1.7 + t = -2.547547841 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-1.7' to each side of the equation. 1.7 + -1.7 + t = -2.547547841 + -1.7 Combine like terms: 1.7 + -1.7 = 0.0 0.0 + t = -2.547547841 + -1.7 t = -2.547547841 + -1.7 Combine like terms: -2.547547841 + -1.7 = -4.247547841 t = -4.247547841 Simplifying t = -4.247547841

Solution

The solution to the problem is based on the solutions from the subproblems. t = {0.847547841, -4.247547841}

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