15t-5=t^2

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Solution for 15t-5=t^2 equation:


Simplifying
15t + -5 = t2

Reorder the terms:
-5 + 15t = t2

Solving
-5 + 15t = t2

Solving for variable 't'.

Combine like terms: t2 + -1t2 = 0
-5 + 15t + -1t2 = 0

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

Divide each side by '-1'.
5 + -15t + t2 = 0

Move the constant term to the right:

Add '-5' to each side of the equation.
5 + -15t + -5 + t2 = 0 + -5

Reorder the terms:
5 + -5 + -15t + t2 = 0 + -5

Combine like terms: 5 + -5 = 0
0 + -15t + t2 = 0 + -5
-15t + t2 = 0 + -5

Combine like terms: 0 + -5 = -5
-15t + t2 = -5

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 = -5 + 56.25

Reorder the terms:
56.25 + -15t + t2 = -5 + 56.25

Combine like terms: -5 + 56.25 = 51.25
56.25 + -15t + t2 = 51.25

Factor a perfect square on the left side:
(t + -7.5)(t + -7.5) = 51.25

Calculate the square root of the right side: 7.158910532

Break this problem into two subproblems by setting 
(t + -7.5) equal to 7.158910532 and -7.158910532.

Subproblem 1

t + -7.5 = 7.158910532 Simplifying t + -7.5 = 7.158910532 Reorder the terms: -7.5 + t = 7.158910532 Solving -7.5 + t = 7.158910532 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 = 7.158910532 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + t = 7.158910532 + 7.5 t = 7.158910532 + 7.5 Combine like terms: 7.158910532 + 7.5 = 14.658910532 t = 14.658910532 Simplifying t = 14.658910532

Subproblem 2

t + -7.5 = -7.158910532 Simplifying t + -7.5 = -7.158910532 Reorder the terms: -7.5 + t = -7.158910532 Solving -7.5 + t = -7.158910532 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 = -7.158910532 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + t = -7.158910532 + 7.5 t = -7.158910532 + 7.5 Combine like terms: -7.158910532 + 7.5 = 0.341089468 t = 0.341089468 Simplifying t = 0.341089468

Solution

The solution to the problem is based on the solutions from the subproblems. t = {14.658910532, 0.341089468}

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