-5q^2+7q+5=0

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Solution for -5q^2+7q+5=0 equation:


Simplifying
-5q2 + 7q + 5 = 0

Reorder the terms:
5 + 7q + -5q2 = 0

Solving
5 + 7q + -5q2 = 0

Solving for variable 'q'.

Begin completing the square.  Divide all terms by
-5 the coefficient of the squared term: 

Divide each side by '-5'.
-1 + -1.4q + q2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -1.4q + 1 + q2 = 0 + 1

Reorder the terms:
-1 + 1 + -1.4q + q2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -1.4q + q2 = 0 + 1
-1.4q + q2 = 0 + 1

Combine like terms: 0 + 1 = 1
-1.4q + q2 = 1

The q term is -1.4q.  Take half its coefficient (-0.7).
Square it (0.49) and add it to both sides.

Add '0.49' to each side of the equation.
-1.4q + 0.49 + q2 = 1 + 0.49

Reorder the terms:
0.49 + -1.4q + q2 = 1 + 0.49

Combine like terms: 1 + 0.49 = 1.49
0.49 + -1.4q + q2 = 1.49

Factor a perfect square on the left side:
(q + -0.7)(q + -0.7) = 1.49

Calculate the square root of the right side: 1.220655562

Break this problem into two subproblems by setting 
(q + -0.7) equal to 1.220655562 and -1.220655562.

Subproblem 1

q + -0.7 = 1.220655562 Simplifying q + -0.7 = 1.220655562 Reorder the terms: -0.7 + q = 1.220655562 Solving -0.7 + q = 1.220655562 Solving for variable 'q'. Move all terms containing q to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + q = 1.220655562 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + q = 1.220655562 + 0.7 q = 1.220655562 + 0.7 Combine like terms: 1.220655562 + 0.7 = 1.920655562 q = 1.920655562 Simplifying q = 1.920655562

Subproblem 2

q + -0.7 = -1.220655562 Simplifying q + -0.7 = -1.220655562 Reorder the terms: -0.7 + q = -1.220655562 Solving -0.7 + q = -1.220655562 Solving for variable 'q'. Move all terms containing q to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + q = -1.220655562 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + q = -1.220655562 + 0.7 q = -1.220655562 + 0.7 Combine like terms: -1.220655562 + 0.7 = -0.520655562 q = -0.520655562 Simplifying q = -0.520655562

Solution

The solution to the problem is based on the solutions from the subproblems. q = {1.920655562, -0.520655562}

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