2t^2-18t+15=0

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Solution for 2t^2-18t+15=0 equation:


Simplifying
2t2 + -18t + 15 = 0

Reorder the terms:
15 + -18t + 2t2 = 0

Solving
15 + -18t + 2t2 = 0

Solving for variable 't'.

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

Divide each side by '2'.
7.5 + -9t + t2 = 0

Move the constant term to the right:

Add '-7.5' to each side of the equation.
7.5 + -9t + -7.5 + t2 = 0 + -7.5

Reorder the terms:
7.5 + -7.5 + -9t + t2 = 0 + -7.5

Combine like terms: 7.5 + -7.5 = 0.0
0.0 + -9t + t2 = 0 + -7.5
-9t + t2 = 0 + -7.5

Combine like terms: 0 + -7.5 = -7.5
-9t + t2 = -7.5

The t term is -9t.  Take half its coefficient (-4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
-9t + 20.25 + t2 = -7.5 + 20.25

Reorder the terms:
20.25 + -9t + t2 = -7.5 + 20.25

Combine like terms: -7.5 + 20.25 = 12.75
20.25 + -9t + t2 = 12.75

Factor a perfect square on the left side:
(t + -4.5)(t + -4.5) = 12.75

Calculate the square root of the right side: 3.570714214

Break this problem into two subproblems by setting 
(t + -4.5) equal to 3.570714214 and -3.570714214.

Subproblem 1

t + -4.5 = 3.570714214 Simplifying t + -4.5 = 3.570714214 Reorder the terms: -4.5 + t = 3.570714214 Solving -4.5 + t = 3.570714214 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + t = 3.570714214 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + t = 3.570714214 + 4.5 t = 3.570714214 + 4.5 Combine like terms: 3.570714214 + 4.5 = 8.070714214 t = 8.070714214 Simplifying t = 8.070714214

Subproblem 2

t + -4.5 = -3.570714214 Simplifying t + -4.5 = -3.570714214 Reorder the terms: -4.5 + t = -3.570714214 Solving -4.5 + t = -3.570714214 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + t = -3.570714214 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + t = -3.570714214 + 4.5 t = -3.570714214 + 4.5 Combine like terms: -3.570714214 + 4.5 = 0.929285786 t = 0.929285786 Simplifying t = 0.929285786

Solution

The solution to the problem is based on the solutions from the subproblems. t = {8.070714214, 0.929285786}

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