t^2-20t+7=0

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Solution for t^2-20t+7=0 equation:


Simplifying
t2 + -20t + 7 = 0

Reorder the terms:
7 + -20t + t2 = 0

Solving
7 + -20t + t2 = 0

Solving for variable 't'.

Begin completing the square.

Move the constant term to the right:

Add '-7' to each side of the equation.
7 + -20t + -7 + t2 = 0 + -7

Reorder the terms:
7 + -7 + -20t + t2 = 0 + -7

Combine like terms: 7 + -7 = 0
0 + -20t + t2 = 0 + -7
-20t + t2 = 0 + -7

Combine like terms: 0 + -7 = -7
-20t + t2 = -7

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 = -7 + 100

Reorder the terms:
100 + -20t + t2 = -7 + 100

Combine like terms: -7 + 100 = 93
100 + -20t + t2 = 93

Factor a perfect square on the left side:
(t + -10)(t + -10) = 93

Calculate the square root of the right side: 9.643650761

Break this problem into two subproblems by setting 
(t + -10) equal to 9.643650761 and -9.643650761.

Subproblem 1

t + -10 = 9.643650761 Simplifying t + -10 = 9.643650761 Reorder the terms: -10 + t = 9.643650761 Solving -10 + t = 9.643650761 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 = 9.643650761 + 10 Combine like terms: -10 + 10 = 0 0 + t = 9.643650761 + 10 t = 9.643650761 + 10 Combine like terms: 9.643650761 + 10 = 19.643650761 t = 19.643650761 Simplifying t = 19.643650761

Subproblem 2

t + -10 = -9.643650761 Simplifying t + -10 = -9.643650761 Reorder the terms: -10 + t = -9.643650761 Solving -10 + t = -9.643650761 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 = -9.643650761 + 10 Combine like terms: -10 + 10 = 0 0 + t = -9.643650761 + 10 t = -9.643650761 + 10 Combine like terms: -9.643650761 + 10 = 0.356349239 t = 0.356349239 Simplifying t = 0.356349239

Solution

The solution to the problem is based on the solutions from the subproblems. t = {19.643650761, 0.356349239}

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