5c^2-3c=7

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Solution for 5c^2-3c=7 equation:


Simplifying
5c2 + -3c = 7

Reorder the terms:
-3c + 5c2 = 7

Solving
-3c + 5c2 = 7

Solving for variable 'c'.

Reorder the terms:
-7 + -3c + 5c2 = 7 + -7

Combine like terms: 7 + -7 = 0
-7 + -3c + 5c2 = 0

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

Divide each side by '5'.
-1.4 + -0.6c + c2 = 0

Move the constant term to the right:

Add '1.4' to each side of the equation.
-1.4 + -0.6c + 1.4 + c2 = 0 + 1.4

Reorder the terms:
-1.4 + 1.4 + -0.6c + c2 = 0 + 1.4

Combine like terms: -1.4 + 1.4 = 0.0
0.0 + -0.6c + c2 = 0 + 1.4
-0.6c + c2 = 0 + 1.4

Combine like terms: 0 + 1.4 = 1.4
-0.6c + c2 = 1.4

The c term is -0.6c.  Take half its coefficient (-0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
-0.6c + 0.09 + c2 = 1.4 + 0.09

Reorder the terms:
0.09 + -0.6c + c2 = 1.4 + 0.09

Combine like terms: 1.4 + 0.09 = 1.49
0.09 + -0.6c + c2 = 1.49

Factor a perfect square on the left side:
(c + -0.3)(c + -0.3) = 1.49

Calculate the square root of the right side: 1.220655562

Break this problem into two subproblems by setting 
(c + -0.3) equal to 1.220655562 and -1.220655562.

Subproblem 1

c + -0.3 = 1.220655562 Simplifying c + -0.3 = 1.220655562 Reorder the terms: -0.3 + c = 1.220655562 Solving -0.3 + c = 1.220655562 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '0.3' to each side of the equation. -0.3 + 0.3 + c = 1.220655562 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + c = 1.220655562 + 0.3 c = 1.220655562 + 0.3 Combine like terms: 1.220655562 + 0.3 = 1.520655562 c = 1.520655562 Simplifying c = 1.520655562

Subproblem 2

c + -0.3 = -1.220655562 Simplifying c + -0.3 = -1.220655562 Reorder the terms: -0.3 + c = -1.220655562 Solving -0.3 + c = -1.220655562 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '0.3' to each side of the equation. -0.3 + 0.3 + c = -1.220655562 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + c = -1.220655562 + 0.3 c = -1.220655562 + 0.3 Combine like terms: -1.220655562 + 0.3 = -0.920655562 c = -0.920655562 Simplifying c = -0.920655562

Solution

The solution to the problem is based on the solutions from the subproblems. c = {1.520655562, -0.920655562}

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