2x(x)+10x+7=0

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Solution for 2x(x)+10x+7=0 equation:


Simplifying
2x(x) + 10x + 7 = 0

Multiply x * x
2x2 + 10x + 7 = 0

Reorder the terms:
7 + 10x + 2x2 = 0

Solving
7 + 10x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
3.5 + 5x + x2 = 0

Move the constant term to the right:

Add '-3.5' to each side of the equation.
3.5 + 5x + -3.5 + x2 = 0 + -3.5

Reorder the terms:
3.5 + -3.5 + 5x + x2 = 0 + -3.5

Combine like terms: 3.5 + -3.5 = 0.0
0.0 + 5x + x2 = 0 + -3.5
5x + x2 = 0 + -3.5

Combine like terms: 0 + -3.5 = -3.5
5x + x2 = -3.5

The x term is 5x.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5x + 6.25 + x2 = -3.5 + 6.25

Reorder the terms:
6.25 + 5x + x2 = -3.5 + 6.25

Combine like terms: -3.5 + 6.25 = 2.75
6.25 + 5x + x2 = 2.75

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 2.75

Calculate the square root of the right side: 1.658312395

Break this problem into two subproblems by setting 
(x + 2.5) equal to 1.658312395 and -1.658312395.

Subproblem 1

x + 2.5 = 1.658312395 Simplifying x + 2.5 = 1.658312395 Reorder the terms: 2.5 + x = 1.658312395 Solving 2.5 + x = 1.658312395 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = 1.658312395 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 1.658312395 + -2.5 x = 1.658312395 + -2.5 Combine like terms: 1.658312395 + -2.5 = -0.841687605 x = -0.841687605 Simplifying x = -0.841687605

Subproblem 2

x + 2.5 = -1.658312395 Simplifying x + 2.5 = -1.658312395 Reorder the terms: 2.5 + x = -1.658312395 Solving 2.5 + x = -1.658312395 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = -1.658312395 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -1.658312395 + -2.5 x = -1.658312395 + -2.5 Combine like terms: -1.658312395 + -2.5 = -4.158312395 x = -4.158312395 Simplifying x = -4.158312395

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.841687605, -4.158312395}

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