t(t-15)=70

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Solution for t(t-15)=70 equation:


Simplifying
t(t + -15) = 70

Reorder the terms:
t(-15 + t) = 70
(-15 * t + t * t) = 70
(-15t + t2) = 70

Solving
-15t + t2 = 70

Solving for variable 't'.

Reorder the terms:
-70 + -15t + t2 = 70 + -70

Combine like terms: 70 + -70 = 0
-70 + -15t + t2 = 0

Begin completing the square.

Move the constant term to the right:

Add '70' to each side of the equation.
-70 + -15t + 70 + t2 = 0 + 70

Reorder the terms:
-70 + 70 + -15t + t2 = 0 + 70

Combine like terms: -70 + 70 = 0
0 + -15t + t2 = 0 + 70
-15t + t2 = 0 + 70

Combine like terms: 0 + 70 = 70
-15t + t2 = 70

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 = 70 + 56.25

Reorder the terms:
56.25 + -15t + t2 = 70 + 56.25

Combine like terms: 70 + 56.25 = 126.25
56.25 + -15t + t2 = 126.25

Factor a perfect square on the left side:
(t + -7.5)(t + -7.5) = 126.25

Calculate the square root of the right side: 11.236102527

Break this problem into two subproblems by setting 
(t + -7.5) equal to 11.236102527 and -11.236102527.

Subproblem 1

t + -7.5 = 11.236102527 Simplifying t + -7.5 = 11.236102527 Reorder the terms: -7.5 + t = 11.236102527 Solving -7.5 + t = 11.236102527 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 = 11.236102527 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + t = 11.236102527 + 7.5 t = 11.236102527 + 7.5 Combine like terms: 11.236102527 + 7.5 = 18.736102527 t = 18.736102527 Simplifying t = 18.736102527

Subproblem 2

t + -7.5 = -11.236102527 Simplifying t + -7.5 = -11.236102527 Reorder the terms: -7.5 + t = -11.236102527 Solving -7.5 + t = -11.236102527 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 = -11.236102527 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + t = -11.236102527 + 7.5 t = -11.236102527 + 7.5 Combine like terms: -11.236102527 + 7.5 = -3.736102527 t = -3.736102527 Simplifying t = -3.736102527

Solution

The solution to the problem is based on the solutions from the subproblems. t = {18.736102527, -3.736102527}

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