q*q+2*q-7=5

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Solution for q*q+2*q-7=5 equation:


Simplifying
q * q + 2q + -7 = 5

Multiply q * q
q2 + 2q + -7 = 5

Reorder the terms:
-7 + 2q + q2 = 5

Solving
-7 + 2q + q2 = 5

Solving for variable 'q'.

Reorder the terms:
-7 + -5 + 2q + q2 = 5 + -5

Combine like terms: -7 + -5 = -12
-12 + 2q + q2 = 5 + -5

Combine like terms: 5 + -5 = 0
-12 + 2q + q2 = 0

Begin completing the square.

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + 2q + 12 + q2 = 0 + 12

Reorder the terms:
-12 + 12 + 2q + q2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + 2q + q2 = 0 + 12
2q + q2 = 0 + 12

Combine like terms: 0 + 12 = 12
2q + q2 = 12

The q term is 2q.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2q + 1 + q2 = 12 + 1

Reorder the terms:
1 + 2q + q2 = 12 + 1

Combine like terms: 12 + 1 = 13
1 + 2q + q2 = 13

Factor a perfect square on the left side:
(q + 1)(q + 1) = 13

Calculate the square root of the right side: 3.605551275

Break this problem into two subproblems by setting 
(q + 1) equal to 3.605551275 and -3.605551275.

Subproblem 1

q + 1 = 3.605551275 Simplifying q + 1 = 3.605551275 Reorder the terms: 1 + q = 3.605551275 Solving 1 + q = 3.605551275 Solving for variable 'q'. Move all terms containing q to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + q = 3.605551275 + -1 Combine like terms: 1 + -1 = 0 0 + q = 3.605551275 + -1 q = 3.605551275 + -1 Combine like terms: 3.605551275 + -1 = 2.605551275 q = 2.605551275 Simplifying q = 2.605551275

Subproblem 2

q + 1 = -3.605551275 Simplifying q + 1 = -3.605551275 Reorder the terms: 1 + q = -3.605551275 Solving 1 + q = -3.605551275 Solving for variable 'q'. Move all terms containing q to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + q = -3.605551275 + -1 Combine like terms: 1 + -1 = 0 0 + q = -3.605551275 + -1 q = -3.605551275 + -1 Combine like terms: -3.605551275 + -1 = -4.605551275 q = -4.605551275 Simplifying q = -4.605551275

Solution

The solution to the problem is based on the solutions from the subproblems. q = {2.605551275, -4.605551275}

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