t^2-8t-20=20

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Solution for t^2-8t-20=20 equation:


Simplifying
t2 + -8t + -20 = 20

Reorder the terms:
-20 + -8t + t2 = 20

Solving
-20 + -8t + t2 = 20

Solving for variable 't'.

Reorder the terms:
-20 + -20 + -8t + t2 = 20 + -20

Combine like terms: -20 + -20 = -40
-40 + -8t + t2 = 20 + -20

Combine like terms: 20 + -20 = 0
-40 + -8t + t2 = 0

Begin completing the square.

Move the constant term to the right:

Add '40' to each side of the equation.
-40 + -8t + 40 + t2 = 0 + 40

Reorder the terms:
-40 + 40 + -8t + t2 = 0 + 40

Combine like terms: -40 + 40 = 0
0 + -8t + t2 = 0 + 40
-8t + t2 = 0 + 40

Combine like terms: 0 + 40 = 40
-8t + t2 = 40

The t term is -8t.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8t + 16 + t2 = 40 + 16

Reorder the terms:
16 + -8t + t2 = 40 + 16

Combine like terms: 40 + 16 = 56
16 + -8t + t2 = 56

Factor a perfect square on the left side:
(t + -4)(t + -4) = 56

Calculate the square root of the right side: 7.483314774

Break this problem into two subproblems by setting 
(t + -4) equal to 7.483314774 and -7.483314774.

Subproblem 1

t + -4 = 7.483314774 Simplifying t + -4 = 7.483314774 Reorder the terms: -4 + t = 7.483314774 Solving -4 + t = 7.483314774 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + t = 7.483314774 + 4 Combine like terms: -4 + 4 = 0 0 + t = 7.483314774 + 4 t = 7.483314774 + 4 Combine like terms: 7.483314774 + 4 = 11.483314774 t = 11.483314774 Simplifying t = 11.483314774

Subproblem 2

t + -4 = -7.483314774 Simplifying t + -4 = -7.483314774 Reorder the terms: -4 + t = -7.483314774 Solving -4 + t = -7.483314774 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + t = -7.483314774 + 4 Combine like terms: -4 + 4 = 0 0 + t = -7.483314774 + 4 t = -7.483314774 + 4 Combine like terms: -7.483314774 + 4 = -3.483314774 t = -3.483314774 Simplifying t = -3.483314774

Solution

The solution to the problem is based on the solutions from the subproblems. t = {11.483314774, -3.483314774}

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