t^2-20t=-12

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Solution for t^2-20t=-12 equation:


Simplifying
t2 + -20t = -12

Reorder the terms:
-20t + t2 = -12

Solving
-20t + t2 = -12

Solving for variable 't'.

Reorder the terms:
12 + -20t + t2 = -12 + 12

Combine like terms: -12 + 12 = 0
12 + -20t + t2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-12' to each side of the equation.
12 + -20t + -12 + t2 = 0 + -12

Reorder the terms:
12 + -12 + -20t + t2 = 0 + -12

Combine like terms: 12 + -12 = 0
0 + -20t + t2 = 0 + -12
-20t + t2 = 0 + -12

Combine like terms: 0 + -12 = -12
-20t + t2 = -12

The t term is -20t.  Take half its coefficient (-10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
-20t + 100 + t2 = -12 + 100

Reorder the terms:
100 + -20t + t2 = -12 + 100

Combine like terms: -12 + 100 = 88
100 + -20t + t2 = 88

Factor a perfect square on the left side:
(t + -10)(t + -10) = 88

Calculate the square root of the right side: 9.38083152

Break this problem into two subproblems by setting 
(t + -10) equal to 9.38083152 and -9.38083152.

Subproblem 1

t + -10 = 9.38083152 Simplifying t + -10 = 9.38083152 Reorder the terms: -10 + t = 9.38083152 Solving -10 + t = 9.38083152 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + t = 9.38083152 + 10 Combine like terms: -10 + 10 = 0 0 + t = 9.38083152 + 10 t = 9.38083152 + 10 Combine like terms: 9.38083152 + 10 = 19.38083152 t = 19.38083152 Simplifying t = 19.38083152

Subproblem 2

t + -10 = -9.38083152 Simplifying t + -10 = -9.38083152 Reorder the terms: -10 + t = -9.38083152 Solving -10 + t = -9.38083152 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + t = -9.38083152 + 10 Combine like terms: -10 + 10 = 0 0 + t = -9.38083152 + 10 t = -9.38083152 + 10 Combine like terms: -9.38083152 + 10 = 0.61916848 t = 0.61916848 Simplifying t = 0.61916848

Solution

The solution to the problem is based on the solutions from the subproblems. t = {19.38083152, 0.61916848}

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