7(18-t)2t=-39

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Solution for 7(18-t)2t=-39 equation:


Simplifying
7(18 + -1t) * 2t = -39

Reorder the terms for easier multiplication:
7 * 2t(18 + -1t) = -39

Multiply 7 * 2
14t(18 + -1t) = -39
(18 * 14t + -1t * 14t) = -39
(252t + -14t2) = -39

Solving
252t + -14t2 = -39

Solving for variable 't'.

Reorder the terms:
39 + 252t + -14t2 = -39 + 39

Combine like terms: -39 + 39 = 0
39 + 252t + -14t2 = 0

Begin completing the square.  Divide all terms by
-14 the coefficient of the squared term: 

Divide each side by '-14'.
-2.785714286 + -18t + t2 = 0

Move the constant term to the right:

Add '2.785714286' to each side of the equation.
-2.785714286 + -18t + 2.785714286 + t2 = 0 + 2.785714286

Reorder the terms:
-2.785714286 + 2.785714286 + -18t + t2 = 0 + 2.785714286

Combine like terms: -2.785714286 + 2.785714286 = 0.000000000
0.000000000 + -18t + t2 = 0 + 2.785714286
-18t + t2 = 0 + 2.785714286

Combine like terms: 0 + 2.785714286 = 2.785714286
-18t + t2 = 2.785714286

The t term is -18t.  Take half its coefficient (-9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
-18t + 81 + t2 = 2.785714286 + 81

Reorder the terms:
81 + -18t + t2 = 2.785714286 + 81

Combine like terms: 2.785714286 + 81 = 83.785714286
81 + -18t + t2 = 83.785714286

Factor a perfect square on the left side:
(t + -9)(t + -9) = 83.785714286

Calculate the square root of the right side: 9.153453681

Break this problem into two subproblems by setting 
(t + -9) equal to 9.153453681 and -9.153453681.

Subproblem 1

t + -9 = 9.153453681 Simplifying t + -9 = 9.153453681 Reorder the terms: -9 + t = 9.153453681 Solving -9 + t = 9.153453681 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + t = 9.153453681 + 9 Combine like terms: -9 + 9 = 0 0 + t = 9.153453681 + 9 t = 9.153453681 + 9 Combine like terms: 9.153453681 + 9 = 18.153453681 t = 18.153453681 Simplifying t = 18.153453681

Subproblem 2

t + -9 = -9.153453681 Simplifying t + -9 = -9.153453681 Reorder the terms: -9 + t = -9.153453681 Solving -9 + t = -9.153453681 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + t = -9.153453681 + 9 Combine like terms: -9 + 9 = 0 0 + t = -9.153453681 + 9 t = -9.153453681 + 9 Combine like terms: -9.153453681 + 9 = -0.153453681 t = -0.153453681 Simplifying t = -0.153453681

Solution

The solution to the problem is based on the solutions from the subproblems. t = {18.153453681, -0.153453681}

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