2x(x-5)=35

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Solution for 2x(x-5)=35 equation:


Simplifying
2x(x + -5) = 35

Reorder the terms:
2x(-5 + x) = 35
(-5 * 2x + x * 2x) = 35
(-10x + 2x2) = 35

Solving
-10x + 2x2 = 35

Solving for variable 'x'.

Reorder the terms:
-35 + -10x + 2x2 = 35 + -35

Combine like terms: 35 + -35 = 0
-35 + -10x + 2x2 = 0

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

Divide each side by '2'.
-17.5 + -5x + x2 = 0

Move the constant term to the right:

Add '17.5' to each side of the equation.
-17.5 + -5x + 17.5 + x2 = 0 + 17.5

Reorder the terms:
-17.5 + 17.5 + -5x + x2 = 0 + 17.5

Combine like terms: -17.5 + 17.5 = 0.0
0.0 + -5x + x2 = 0 + 17.5
-5x + x2 = 0 + 17.5

Combine like terms: 0 + 17.5 = 17.5
-5x + x2 = 17.5

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 = 17.5 + 6.25

Reorder the terms:
6.25 + -5x + x2 = 17.5 + 6.25

Combine like terms: 17.5 + 6.25 = 23.75
6.25 + -5x + x2 = 23.75

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 23.75

Calculate the square root of the right side: 4.873397172

Break this problem into two subproblems by setting 
(x + -2.5) equal to 4.873397172 and -4.873397172.

Subproblem 1

x + -2.5 = 4.873397172 Simplifying x + -2.5 = 4.873397172 Reorder the terms: -2.5 + x = 4.873397172 Solving -2.5 + x = 4.873397172 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 = 4.873397172 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 4.873397172 + 2.5 x = 4.873397172 + 2.5 Combine like terms: 4.873397172 + 2.5 = 7.373397172 x = 7.373397172 Simplifying x = 7.373397172

Subproblem 2

x + -2.5 = -4.873397172 Simplifying x + -2.5 = -4.873397172 Reorder the terms: -2.5 + x = -4.873397172 Solving -2.5 + x = -4.873397172 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 = -4.873397172 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -4.873397172 + 2.5 x = -4.873397172 + 2.5 Combine like terms: -4.873397172 + 2.5 = -2.373397172 x = -2.373397172 Simplifying x = -2.373397172

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.373397172, -2.373397172}

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