t^2-100t-21=0

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Solution for t^2-100t-21=0 equation:


Simplifying
t2 + -100t + -21 = 0

Reorder the terms:
-21 + -100t + t2 = 0

Solving
-21 + -100t + t2 = 0

Solving for variable 't'.

Begin completing the square.

Move the constant term to the right:

Add '21' to each side of the equation.
-21 + -100t + 21 + t2 = 0 + 21

Reorder the terms:
-21 + 21 + -100t + t2 = 0 + 21

Combine like terms: -21 + 21 = 0
0 + -100t + t2 = 0 + 21
-100t + t2 = 0 + 21

Combine like terms: 0 + 21 = 21
-100t + t2 = 21

The t term is -100t.  Take half its coefficient (-50).
Square it (2500) and add it to both sides.

Add '2500' to each side of the equation.
-100t + 2500 + t2 = 21 + 2500

Reorder the terms:
2500 + -100t + t2 = 21 + 2500

Combine like terms: 21 + 2500 = 2521
2500 + -100t + t2 = 2521

Factor a perfect square on the left side:
(t + -50)(t + -50) = 2521

Calculate the square root of the right side: 50.209560843

Break this problem into two subproblems by setting 
(t + -50) equal to 50.209560843 and -50.209560843.

Subproblem 1

t + -50 = 50.209560843 Simplifying t + -50 = 50.209560843 Reorder the terms: -50 + t = 50.209560843 Solving -50 + t = 50.209560843 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '50' to each side of the equation. -50 + 50 + t = 50.209560843 + 50 Combine like terms: -50 + 50 = 0 0 + t = 50.209560843 + 50 t = 50.209560843 + 50 Combine like terms: 50.209560843 + 50 = 100.209560843 t = 100.209560843 Simplifying t = 100.209560843

Subproblem 2

t + -50 = -50.209560843 Simplifying t + -50 = -50.209560843 Reorder the terms: -50 + t = -50.209560843 Solving -50 + t = -50.209560843 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '50' to each side of the equation. -50 + 50 + t = -50.209560843 + 50 Combine like terms: -50 + 50 = 0 0 + t = -50.209560843 + 50 t = -50.209560843 + 50 Combine like terms: -50.209560843 + 50 = -0.209560843 t = -0.209560843 Simplifying t = -0.209560843

Solution

The solution to the problem is based on the solutions from the subproblems. t = {100.209560843, -0.209560843}

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