t^2+10t=100

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Solution for t^2+10t=100 equation:


Simplifying
t2 + 10t = 100

Reorder the terms:
10t + t2 = 100

Solving
10t + t2 = 100

Solving for variable 't'.

Reorder the terms:
-100 + 10t + t2 = 100 + -100

Combine like terms: 100 + -100 = 0
-100 + 10t + t2 = 0

Begin completing the square.

Move the constant term to the right:

Add '100' to each side of the equation.
-100 + 10t + 100 + t2 = 0 + 100

Reorder the terms:
-100 + 100 + 10t + t2 = 0 + 100

Combine like terms: -100 + 100 = 0
0 + 10t + t2 = 0 + 100
10t + t2 = 0 + 100

Combine like terms: 0 + 100 = 100
10t + t2 = 100

The t term is 10t.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10t + 25 + t2 = 100 + 25

Reorder the terms:
25 + 10t + t2 = 100 + 25

Combine like terms: 100 + 25 = 125
25 + 10t + t2 = 125

Factor a perfect square on the left side:
(t + 5)(t + 5) = 125

Calculate the square root of the right side: 11.180339887

Break this problem into two subproblems by setting 
(t + 5) equal to 11.180339887 and -11.180339887.

Subproblem 1

t + 5 = 11.180339887 Simplifying t + 5 = 11.180339887 Reorder the terms: 5 + t = 11.180339887 Solving 5 + t = 11.180339887 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + t = 11.180339887 + -5 Combine like terms: 5 + -5 = 0 0 + t = 11.180339887 + -5 t = 11.180339887 + -5 Combine like terms: 11.180339887 + -5 = 6.180339887 t = 6.180339887 Simplifying t = 6.180339887

Subproblem 2

t + 5 = -11.180339887 Simplifying t + 5 = -11.180339887 Reorder the terms: 5 + t = -11.180339887 Solving 5 + t = -11.180339887 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + t = -11.180339887 + -5 Combine like terms: 5 + -5 = 0 0 + t = -11.180339887 + -5 t = -11.180339887 + -5 Combine like terms: -11.180339887 + -5 = -16.180339887 t = -16.180339887 Simplifying t = -16.180339887

Solution

The solution to the problem is based on the solutions from the subproblems. t = {6.180339887, -16.180339887}

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