.1q^2+q=.2q+1

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Solution for .1q^2+q=.2q+1 equation:


Simplifying
0.1q2 + q = 0.2q + 1

Reorder the terms:
q + 0.1q2 = 0.2q + 1

Reorder the terms:
q + 0.1q2 = 1 + 0.2q

Solving
q + 0.1q2 = 1 + 0.2q

Solving for variable 'q'.

Reorder the terms:
-1 + q + -0.2q + 0.1q2 = 1 + 0.2q + -1 + -0.2q

Combine like terms: q + -0.2q = 0.8q
-1 + 0.8q + 0.1q2 = 1 + 0.2q + -1 + -0.2q

Reorder the terms:
-1 + 0.8q + 0.1q2 = 1 + -1 + 0.2q + -0.2q

Combine like terms: 1 + -1 = 0
-1 + 0.8q + 0.1q2 = 0 + 0.2q + -0.2q
-1 + 0.8q + 0.1q2 = 0.2q + -0.2q

Combine like terms: 0.2q + -0.2q = 0.0
-1 + 0.8q + 0.1q2 = 0.0

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

Divide each side by '0.1'.
-10 + 8q + q2 = 0

Move the constant term to the right:

Add '10' to each side of the equation.
-10 + 8q + 10 + q2 = 0 + 10

Reorder the terms:
-10 + 10 + 8q + q2 = 0 + 10

Combine like terms: -10 + 10 = 0
0 + 8q + q2 = 0 + 10
8q + q2 = 0 + 10

Combine like terms: 0 + 10 = 10
8q + q2 = 10

The q term is 8q.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8q + 16 + q2 = 10 + 16

Reorder the terms:
16 + 8q + q2 = 10 + 16

Combine like terms: 10 + 16 = 26
16 + 8q + q2 = 26

Factor a perfect square on the left side:
(q + 4)(q + 4) = 26

Calculate the square root of the right side: 5.099019514

Break this problem into two subproblems by setting 
(q + 4) equal to 5.099019514 and -5.099019514.

Subproblem 1

q + 4 = 5.099019514 Simplifying q + 4 = 5.099019514 Reorder the terms: 4 + q = 5.099019514 Solving 4 + q = 5.099019514 Solving for variable 'q'. Move all terms containing q to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + q = 5.099019514 + -4 Combine like terms: 4 + -4 = 0 0 + q = 5.099019514 + -4 q = 5.099019514 + -4 Combine like terms: 5.099019514 + -4 = 1.099019514 q = 1.099019514 Simplifying q = 1.099019514

Subproblem 2

q + 4 = -5.099019514 Simplifying q + 4 = -5.099019514 Reorder the terms: 4 + q = -5.099019514 Solving 4 + q = -5.099019514 Solving for variable 'q'. Move all terms containing q to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + q = -5.099019514 + -4 Combine like terms: 4 + -4 = 0 0 + q = -5.099019514 + -4 q = -5.099019514 + -4 Combine like terms: -5.099019514 + -4 = -9.099019514 q = -9.099019514 Simplifying q = -9.099019514

Solution

The solution to the problem is based on the solutions from the subproblems. q = {1.099019514, -9.099019514}

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