7q+3=5q+2q(q-4)

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Solution for 7q+3=5q+2q(q-4) equation:


Simplifying
7q + 3 = 5q + 2q(q + -4)

Reorder the terms:
3 + 7q = 5q + 2q(q + -4)

Reorder the terms:
3 + 7q = 5q + 2q(-4 + q)
3 + 7q = 5q + (-4 * 2q + q * 2q)
3 + 7q = 5q + (-8q + 2q2)

Combine like terms: 5q + -8q = -3q
3 + 7q = -3q + 2q2

Solving
3 + 7q = -3q + 2q2

Solving for variable 'q'.

Combine like terms: 7q + 3q = 10q
3 + 10q + -2q2 = -3q + 2q2 + 3q + -2q2

Reorder the terms:
3 + 10q + -2q2 = -3q + 3q + 2q2 + -2q2

Combine like terms: -3q + 3q = 0
3 + 10q + -2q2 = 0 + 2q2 + -2q2
3 + 10q + -2q2 = 2q2 + -2q2

Combine like terms: 2q2 + -2q2 = 0
3 + 10q + -2q2 = 0

Begin completing the square.  Divide all terms by
-2 the coefficient of the squared term: 

Divide each side by '-2'.
-1.5 + -5q + q2 = 0

Move the constant term to the right:

Add '1.5' to each side of the equation.
-1.5 + -5q + 1.5 + q2 = 0 + 1.5

Reorder the terms:
-1.5 + 1.5 + -5q + q2 = 0 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + -5q + q2 = 0 + 1.5
-5q + q2 = 0 + 1.5

Combine like terms: 0 + 1.5 = 1.5
-5q + q2 = 1.5

The q term is -5q.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5q + 6.25 + q2 = 1.5 + 6.25

Reorder the terms:
6.25 + -5q + q2 = 1.5 + 6.25

Combine like terms: 1.5 + 6.25 = 7.75
6.25 + -5q + q2 = 7.75

Factor a perfect square on the left side:
(q + -2.5)(q + -2.5) = 7.75

Calculate the square root of the right side: 2.783882181

Break this problem into two subproblems by setting 
(q + -2.5) equal to 2.783882181 and -2.783882181.

Subproblem 1

q + -2.5 = 2.783882181 Simplifying q + -2.5 = 2.783882181 Reorder the terms: -2.5 + q = 2.783882181 Solving -2.5 + q = 2.783882181 Solving for variable 'q'. Move all terms containing q to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + q = 2.783882181 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + q = 2.783882181 + 2.5 q = 2.783882181 + 2.5 Combine like terms: 2.783882181 + 2.5 = 5.283882181 q = 5.283882181 Simplifying q = 5.283882181

Subproblem 2

q + -2.5 = -2.783882181 Simplifying q + -2.5 = -2.783882181 Reorder the terms: -2.5 + q = -2.783882181 Solving -2.5 + q = -2.783882181 Solving for variable 'q'. Move all terms containing q to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + q = -2.783882181 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + q = -2.783882181 + 2.5 q = -2.783882181 + 2.5 Combine like terms: -2.783882181 + 2.5 = -0.283882181 q = -0.283882181 Simplifying q = -0.283882181

Solution

The solution to the problem is based on the solutions from the subproblems. q = {5.283882181, -0.283882181}

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