(2c^2+7c-1)-(c^2-10c+4)=0

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Solution for (2c^2+7c-1)-(c^2-10c+4)=0 equation:


Simplifying
(2c2 + 7c + -1) + -1(c2 + -10c + 4) = 0

Reorder the terms:
(-1 + 7c + 2c2) + -1(c2 + -10c + 4) = 0

Remove parenthesis around (-1 + 7c + 2c2)
-1 + 7c + 2c2 + -1(c2 + -10c + 4) = 0

Reorder the terms:
-1 + 7c + 2c2 + -1(4 + -10c + c2) = 0
-1 + 7c + 2c2 + (4 * -1 + -10c * -1 + c2 * -1) = 0
-1 + 7c + 2c2 + (-4 + 10c + -1c2) = 0

Reorder the terms:
-1 + -4 + 7c + 10c + 2c2 + -1c2 = 0

Combine like terms: -1 + -4 = -5
-5 + 7c + 10c + 2c2 + -1c2 = 0

Combine like terms: 7c + 10c = 17c
-5 + 17c + 2c2 + -1c2 = 0

Combine like terms: 2c2 + -1c2 = 1c2
-5 + 17c + 1c2 = 0

Solving
-5 + 17c + 1c2 = 0

Solving for variable 'c'.

Begin completing the square.

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + 17c + 5 + c2 = 0 + 5

Reorder the terms:
-5 + 5 + 17c + c2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + 17c + c2 = 0 + 5
17c + c2 = 0 + 5

Combine like terms: 0 + 5 = 5
17c + c2 = 5

The c term is 17c.  Take half its coefficient (8.5).
Square it (72.25) and add it to both sides.

Add '72.25' to each side of the equation.
17c + 72.25 + c2 = 5 + 72.25

Reorder the terms:
72.25 + 17c + c2 = 5 + 72.25

Combine like terms: 5 + 72.25 = 77.25
72.25 + 17c + c2 = 77.25

Factor a perfect square on the left side:
(c + 8.5)(c + 8.5) = 77.25

Calculate the square root of the right side: 8.789197916

Break this problem into two subproblems by setting 
(c + 8.5) equal to 8.789197916 and -8.789197916.

Subproblem 1

c + 8.5 = 8.789197916 Simplifying c + 8.5 = 8.789197916 Reorder the terms: 8.5 + c = 8.789197916 Solving 8.5 + c = 8.789197916 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-8.5' to each side of the equation. 8.5 + -8.5 + c = 8.789197916 + -8.5 Combine like terms: 8.5 + -8.5 = 0.0 0.0 + c = 8.789197916 + -8.5 c = 8.789197916 + -8.5 Combine like terms: 8.789197916 + -8.5 = 0.289197916 c = 0.289197916 Simplifying c = 0.289197916

Subproblem 2

c + 8.5 = -8.789197916 Simplifying c + 8.5 = -8.789197916 Reorder the terms: 8.5 + c = -8.789197916 Solving 8.5 + c = -8.789197916 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-8.5' to each side of the equation. 8.5 + -8.5 + c = -8.789197916 + -8.5 Combine like terms: 8.5 + -8.5 = 0.0 0.0 + c = -8.789197916 + -8.5 c = -8.789197916 + -8.5 Combine like terms: -8.789197916 + -8.5 = -17.289197916 c = -17.289197916 Simplifying c = -17.289197916

Solution

The solution to the problem is based on the solutions from the subproblems. c = {0.289197916, -17.289197916}

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