(7x^2-5x-14)+(7x^2+8x)=

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Solution for (7x^2-5x-14)+(7x^2+8x)= equation:


Simplifying
(7x2 + -5x + -14) + (7x2 + 8x) = 0

Reorder the terms:
(-14 + -5x + 7x2) + (7x2 + 8x) = 0

Remove parenthesis around (-14 + -5x + 7x2)
-14 + -5x + 7x2 + (7x2 + 8x) = 0

Reorder the terms:
-14 + -5x + 7x2 + (8x + 7x2) = 0

Remove parenthesis around (8x + 7x2)
-14 + -5x + 7x2 + 8x + 7x2 = 0

Reorder the terms:
-14 + -5x + 8x + 7x2 + 7x2 = 0

Combine like terms: -5x + 8x = 3x
-14 + 3x + 7x2 + 7x2 = 0

Combine like terms: 7x2 + 7x2 = 14x2
-14 + 3x + 14x2 = 0

Solving
-14 + 3x + 14x2 = 0

Solving for variable 'x'.

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

Divide each side by '14'.
-1 + 0.2142857143x + x2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + 0.2142857143x + 1 + x2 = 0 + 1

Reorder the terms:
-1 + 1 + 0.2142857143x + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 0.2142857143x + x2 = 0 + 1
0.2142857143x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
0.2142857143x + x2 = 1

The x term is 0.2142857143x.  Take half its coefficient (0.1071428572).
Square it (0.01147959185) and add it to both sides.

Add '0.01147959185' to each side of the equation.
0.2142857143x + 0.01147959185 + x2 = 1 + 0.01147959185

Reorder the terms:
0.01147959185 + 0.2142857143x + x2 = 1 + 0.01147959185

Combine like terms: 1 + 0.01147959185 = 1.01147959185
0.01147959185 + 0.2142857143x + x2 = 1.01147959185

Factor a perfect square on the left side:
(x + 0.1071428572)(x + 0.1071428572) = 1.01147959185

Calculate the square root of the right side: 1.005723417

Break this problem into two subproblems by setting 
(x + 0.1071428572) equal to 1.005723417 and -1.005723417.

Subproblem 1

x + 0.1071428572 = 1.005723417 Simplifying x + 0.1071428572 = 1.005723417 Reorder the terms: 0.1071428572 + x = 1.005723417 Solving 0.1071428572 + x = 1.005723417 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1071428572' to each side of the equation. 0.1071428572 + -0.1071428572 + x = 1.005723417 + -0.1071428572 Combine like terms: 0.1071428572 + -0.1071428572 = 0.0000000000 0.0000000000 + x = 1.005723417 + -0.1071428572 x = 1.005723417 + -0.1071428572 Combine like terms: 1.005723417 + -0.1071428572 = 0.8985805598 x = 0.8985805598 Simplifying x = 0.8985805598

Subproblem 2

x + 0.1071428572 = -1.005723417 Simplifying x + 0.1071428572 = -1.005723417 Reorder the terms: 0.1071428572 + x = -1.005723417 Solving 0.1071428572 + x = -1.005723417 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1071428572' to each side of the equation. 0.1071428572 + -0.1071428572 + x = -1.005723417 + -0.1071428572 Combine like terms: 0.1071428572 + -0.1071428572 = 0.0000000000 0.0000000000 + x = -1.005723417 + -0.1071428572 x = -1.005723417 + -0.1071428572 Combine like terms: -1.005723417 + -0.1071428572 = -1.1128662742 x = -1.1128662742 Simplifying x = -1.1128662742

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.8985805598, -1.1128662742}

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