2(2t-5)t=20-t

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Solution for 2(2t-5)t=20-t equation:


Simplifying
2(2t + -5) * t = 20 + -1t

Reorder the terms:
2(-5 + 2t) * t = 20 + -1t

Reorder the terms for easier multiplication:
2t(-5 + 2t) = 20 + -1t
(-5 * 2t + 2t * 2t) = 20 + -1t
(-10t + 4t2) = 20 + -1t

Solving
-10t + 4t2 = 20 + -1t

Solving for variable 't'.

Reorder the terms:
-20 + -10t + t + 4t2 = 20 + -1t + -20 + t

Combine like terms: -10t + t = -9t
-20 + -9t + 4t2 = 20 + -1t + -20 + t

Reorder the terms:
-20 + -9t + 4t2 = 20 + -20 + -1t + t

Combine like terms: 20 + -20 = 0
-20 + -9t + 4t2 = 0 + -1t + t
-20 + -9t + 4t2 = -1t + t

Combine like terms: -1t + t = 0
-20 + -9t + 4t2 = 0

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

Divide each side by '4'.
-5 + -2.25t + t2 = 0

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + -2.25t + 5 + t2 = 0 + 5

Reorder the terms:
-5 + 5 + -2.25t + t2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -2.25t + t2 = 0 + 5
-2.25t + t2 = 0 + 5

Combine like terms: 0 + 5 = 5
-2.25t + t2 = 5

The t term is -2.25t.  Take half its coefficient (-1.125).
Square it (1.265625) and add it to both sides.

Add '1.265625' to each side of the equation.
-2.25t + 1.265625 + t2 = 5 + 1.265625

Reorder the terms:
1.265625 + -2.25t + t2 = 5 + 1.265625

Combine like terms: 5 + 1.265625 = 6.265625
1.265625 + -2.25t + t2 = 6.265625

Factor a perfect square on the left side:
(t + -1.125)(t + -1.125) = 6.265625

Calculate the square root of the right side: 2.503123049

Break this problem into two subproblems by setting 
(t + -1.125) equal to 2.503123049 and -2.503123049.

Subproblem 1

t + -1.125 = 2.503123049 Simplifying t + -1.125 = 2.503123049 Reorder the terms: -1.125 + t = 2.503123049 Solving -1.125 + t = 2.503123049 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.125' to each side of the equation. -1.125 + 1.125 + t = 2.503123049 + 1.125 Combine like terms: -1.125 + 1.125 = 0.000 0.000 + t = 2.503123049 + 1.125 t = 2.503123049 + 1.125 Combine like terms: 2.503123049 + 1.125 = 3.628123049 t = 3.628123049 Simplifying t = 3.628123049

Subproblem 2

t + -1.125 = -2.503123049 Simplifying t + -1.125 = -2.503123049 Reorder the terms: -1.125 + t = -2.503123049 Solving -1.125 + t = -2.503123049 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.125' to each side of the equation. -1.125 + 1.125 + t = -2.503123049 + 1.125 Combine like terms: -1.125 + 1.125 = 0.000 0.000 + t = -2.503123049 + 1.125 t = -2.503123049 + 1.125 Combine like terms: -2.503123049 + 1.125 = -1.378123049 t = -1.378123049 Simplifying t = -1.378123049

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.628123049, -1.378123049}

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