10x^2+20x+7=0

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Solution for 10x^2+20x+7=0 equation:


Simplifying
10x2 + 20x + 7 = 0

Reorder the terms:
7 + 20x + 10x2 = 0

Solving
7 + 20x + 10x2 = 0

Solving for variable 'x'.

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

Divide each side by '10'.
0.7 + 2x + x2 = 0

Move the constant term to the right:

Add '-0.7' to each side of the equation.
0.7 + 2x + -0.7 + x2 = 0 + -0.7

Reorder the terms:
0.7 + -0.7 + 2x + x2 = 0 + -0.7

Combine like terms: 0.7 + -0.7 = 0.0
0.0 + 2x + x2 = 0 + -0.7
2x + x2 = 0 + -0.7

Combine like terms: 0 + -0.7 = -0.7
2x + x2 = -0.7

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = -0.7 + 1

Reorder the terms:
1 + 2x + x2 = -0.7 + 1

Combine like terms: -0.7 + 1 = 0.3
1 + 2x + x2 = 0.3

Factor a perfect square on the left side:
(x + 1)(x + 1) = 0.3

Calculate the square root of the right side: 0.547722558

Break this problem into two subproblems by setting 
(x + 1) equal to 0.547722558 and -0.547722558.

Subproblem 1

x + 1 = 0.547722558 Simplifying x + 1 = 0.547722558 Reorder the terms: 1 + x = 0.547722558 Solving 1 + x = 0.547722558 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 0.547722558 + -1 Combine like terms: 1 + -1 = 0 0 + x = 0.547722558 + -1 x = 0.547722558 + -1 Combine like terms: 0.547722558 + -1 = -0.452277442 x = -0.452277442 Simplifying x = -0.452277442

Subproblem 2

x + 1 = -0.547722558 Simplifying x + 1 = -0.547722558 Reorder the terms: 1 + x = -0.547722558 Solving 1 + x = -0.547722558 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -0.547722558 + -1 Combine like terms: 1 + -1 = 0 0 + x = -0.547722558 + -1 x = -0.547722558 + -1 Combine like terms: -0.547722558 + -1 = -1.547722558 x = -1.547722558 Simplifying x = -1.547722558

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.452277442, -1.547722558}

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