3+15*t-t^2=11

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Solution for 3+15*t-t^2=11 equation:


Simplifying
3 + 15t + -1t2 = 11

Solving
3 + 15t + -1t2 = 11

Solving for variable 't'.

Reorder the terms:
3 + -11 + 15t + -1t2 = 11 + -11

Combine like terms: 3 + -11 = -8
-8 + 15t + -1t2 = 11 + -11

Combine like terms: 11 + -11 = 0
-8 + 15t + -1t2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
8 + -15t + t2 = 0

Move the constant term to the right:

Add '-8' to each side of the equation.
8 + -15t + -8 + t2 = 0 + -8

Reorder the terms:
8 + -8 + -15t + t2 = 0 + -8

Combine like terms: 8 + -8 = 0
0 + -15t + t2 = 0 + -8
-15t + t2 = 0 + -8

Combine like terms: 0 + -8 = -8
-15t + t2 = -8

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 = -8 + 56.25

Reorder the terms:
56.25 + -15t + t2 = -8 + 56.25

Combine like terms: -8 + 56.25 = 48.25
56.25 + -15t + t2 = 48.25

Factor a perfect square on the left side:
(t + -7.5)(t + -7.5) = 48.25

Calculate the square root of the right side: 6.946221995

Break this problem into two subproblems by setting 
(t + -7.5) equal to 6.946221995 and -6.946221995.

Subproblem 1

t + -7.5 = 6.946221995 Simplifying t + -7.5 = 6.946221995 Reorder the terms: -7.5 + t = 6.946221995 Solving -7.5 + t = 6.946221995 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 = 6.946221995 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + t = 6.946221995 + 7.5 t = 6.946221995 + 7.5 Combine like terms: 6.946221995 + 7.5 = 14.446221995 t = 14.446221995 Simplifying t = 14.446221995

Subproblem 2

t + -7.5 = -6.946221995 Simplifying t + -7.5 = -6.946221995 Reorder the terms: -7.5 + t = -6.946221995 Solving -7.5 + t = -6.946221995 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 = -6.946221995 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + t = -6.946221995 + 7.5 t = -6.946221995 + 7.5 Combine like terms: -6.946221995 + 7.5 = 0.553778005 t = 0.553778005 Simplifying t = 0.553778005

Solution

The solution to the problem is based on the solutions from the subproblems. t = {14.446221995, 0.553778005}

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