2x^2+4x=35

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Solution for 2x^2+4x=35 equation:


Simplifying
2x2 + 4x = 35

Reorder the terms:
4x + 2x2 = 35

Solving
4x + 2x2 = 35

Solving for variable 'x'.

Reorder the terms:
-35 + 4x + 2x2 = 35 + -35

Combine like terms: 35 + -35 = 0
-35 + 4x + 2x2 = 0

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

Divide each side by '2'.
-17.5 + 2x + x2 = 0

Move the constant term to the right:

Add '17.5' to each side of the equation.
-17.5 + 2x + 17.5 + x2 = 0 + 17.5

Reorder the terms:
-17.5 + 17.5 + 2x + x2 = 0 + 17.5

Combine like terms: -17.5 + 17.5 = 0.0
0.0 + 2x + x2 = 0 + 17.5
2x + x2 = 0 + 17.5

Combine like terms: 0 + 17.5 = 17.5
2x + x2 = 17.5

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 = 17.5 + 1

Reorder the terms:
1 + 2x + x2 = 17.5 + 1

Combine like terms: 17.5 + 1 = 18.5
1 + 2x + x2 = 18.5

Factor a perfect square on the left side:
(x + 1)(x + 1) = 18.5

Calculate the square root of the right side: 4.301162634

Break this problem into two subproblems by setting 
(x + 1) equal to 4.301162634 and -4.301162634.

Subproblem 1

x + 1 = 4.301162634 Simplifying x + 1 = 4.301162634 Reorder the terms: 1 + x = 4.301162634 Solving 1 + x = 4.301162634 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 = 4.301162634 + -1 Combine like terms: 1 + -1 = 0 0 + x = 4.301162634 + -1 x = 4.301162634 + -1 Combine like terms: 4.301162634 + -1 = 3.301162634 x = 3.301162634 Simplifying x = 3.301162634

Subproblem 2

x + 1 = -4.301162634 Simplifying x + 1 = -4.301162634 Reorder the terms: 1 + x = -4.301162634 Solving 1 + x = -4.301162634 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 = -4.301162634 + -1 Combine like terms: 1 + -1 = 0 0 + x = -4.301162634 + -1 x = -4.301162634 + -1 Combine like terms: -4.301162634 + -1 = -5.301162634 x = -5.301162634 Simplifying x = -5.301162634

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.301162634, -5.301162634}

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