t^2-15t+45=0

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Solution for t^2-15t+45=0 equation:


Simplifying
t2 + -15t + 45 = 0

Reorder the terms:
45 + -15t + t2 = 0

Solving
45 + -15t + t2 = 0

Solving for variable 't'.

Begin completing the square.

Move the constant term to the right:

Add '-45' to each side of the equation.
45 + -15t + -45 + t2 = 0 + -45

Reorder the terms:
45 + -45 + -15t + t2 = 0 + -45

Combine like terms: 45 + -45 = 0
0 + -15t + t2 = 0 + -45
-15t + t2 = 0 + -45

Combine like terms: 0 + -45 = -45
-15t + t2 = -45

The t term is -15t.  Take half its coefficient (-7.5).
Square it (56.25) and add it to both sides.

Add '56.25' to each side of the equation.
-15t + 56.25 + t2 = -45 + 56.25

Reorder the terms:
56.25 + -15t + t2 = -45 + 56.25

Combine like terms: -45 + 56.25 = 11.25
56.25 + -15t + t2 = 11.25

Factor a perfect square on the left side:
(t + -7.5)(t + -7.5) = 11.25

Calculate the square root of the right side: 3.354101966

Break this problem into two subproblems by setting 
(t + -7.5) equal to 3.354101966 and -3.354101966.

Subproblem 1

t + -7.5 = 3.354101966 Simplifying t + -7.5 = 3.354101966 Reorder the terms: -7.5 + t = 3.354101966 Solving -7.5 + t = 3.354101966 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '7.5' to each side of the equation. -7.5 + 7.5 + t = 3.354101966 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + t = 3.354101966 + 7.5 t = 3.354101966 + 7.5 Combine like terms: 3.354101966 + 7.5 = 10.854101966 t = 10.854101966 Simplifying t = 10.854101966

Subproblem 2

t + -7.5 = -3.354101966 Simplifying t + -7.5 = -3.354101966 Reorder the terms: -7.5 + t = -3.354101966 Solving -7.5 + t = -3.354101966 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '7.5' to each side of the equation. -7.5 + 7.5 + t = -3.354101966 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + t = -3.354101966 + 7.5 t = -3.354101966 + 7.5 Combine like terms: -3.354101966 + 7.5 = 4.145898034 t = 4.145898034 Simplifying t = 4.145898034

Solution

The solution to the problem is based on the solutions from the subproblems. t = {10.854101966, 4.145898034}

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