100=20t+t^2

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Solution for 100=20t+t^2 equation:


Simplifying
100 = 20t + t2

Solving
100 = 20t + t2

Solving for variable 't'.

Reorder the terms:
100 + -20t + -1t2 = 20t + -20t + t2 + -1t2

Combine like terms: 20t + -20t = 0
100 + -20t + -1t2 = 0 + t2 + -1t2
100 + -20t + -1t2 = t2 + -1t2

Combine like terms: t2 + -1t2 = 0
100 + -20t + -1t2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-100 + 20t + t2 = 0

Move the constant term to the right:

Add '100' to each side of the equation.
-100 + 20t + 100 + t2 = 0 + 100

Reorder the terms:
-100 + 100 + 20t + t2 = 0 + 100

Combine like terms: -100 + 100 = 0
0 + 20t + t2 = 0 + 100
20t + t2 = 0 + 100

Combine like terms: 0 + 100 = 100
20t + t2 = 100

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 = 100 + 100

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

Combine like terms: 100 + 100 = 200
100 + 20t + t2 = 200

Factor a perfect square on the left side:
(t + 10)(t + 10) = 200

Calculate the square root of the right side: 14.142135624

Break this problem into two subproblems by setting 
(t + 10) equal to 14.142135624 and -14.142135624.

Subproblem 1

t + 10 = 14.142135624 Simplifying t + 10 = 14.142135624 Reorder the terms: 10 + t = 14.142135624 Solving 10 + t = 14.142135624 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 = 14.142135624 + -10 Combine like terms: 10 + -10 = 0 0 + t = 14.142135624 + -10 t = 14.142135624 + -10 Combine like terms: 14.142135624 + -10 = 4.142135624 t = 4.142135624 Simplifying t = 4.142135624

Subproblem 2

t + 10 = -14.142135624 Simplifying t + 10 = -14.142135624 Reorder the terms: 10 + t = -14.142135624 Solving 10 + t = -14.142135624 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 = -14.142135624 + -10 Combine like terms: 10 + -10 = 0 0 + t = -14.142135624 + -10 t = -14.142135624 + -10 Combine like terms: -14.142135624 + -10 = -24.142135624 t = -24.142135624 Simplifying t = -24.142135624

Solution

The solution to the problem is based on the solutions from the subproblems. t = {4.142135624, -24.142135624}

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