4x(x-7)=11

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Solution for 4x(x-7)=11 equation:


Simplifying
4x(x + -7) = 11

Reorder the terms:
4x(-7 + x) = 11
(-7 * 4x + x * 4x) = 11
(-28x + 4x2) = 11

Solving
-28x + 4x2 = 11

Solving for variable 'x'.

Reorder the terms:
-11 + -28x + 4x2 = 11 + -11

Combine like terms: 11 + -11 = 0
-11 + -28x + 4x2 = 0

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

Divide each side by '4'.
-2.75 + -7x + x2 = 0

Move the constant term to the right:

Add '2.75' to each side of the equation.
-2.75 + -7x + 2.75 + x2 = 0 + 2.75

Reorder the terms:
-2.75 + 2.75 + -7x + x2 = 0 + 2.75

Combine like terms: -2.75 + 2.75 = 0.00
0.00 + -7x + x2 = 0 + 2.75
-7x + x2 = 0 + 2.75

Combine like terms: 0 + 2.75 = 2.75
-7x + x2 = 2.75

The x term is -7x.  Take half its coefficient (-3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
-7x + 12.25 + x2 = 2.75 + 12.25

Reorder the terms:
12.25 + -7x + x2 = 2.75 + 12.25

Combine like terms: 2.75 + 12.25 = 15
12.25 + -7x + x2 = 15

Factor a perfect square on the left side:
(x + -3.5)(x + -3.5) = 15

Calculate the square root of the right side: 3.872983346

Break this problem into two subproblems by setting 
(x + -3.5) equal to 3.872983346 and -3.872983346.

Subproblem 1

x + -3.5 = 3.872983346 Simplifying x + -3.5 = 3.872983346 Reorder the terms: -3.5 + x = 3.872983346 Solving -3.5 + x = 3.872983346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + x = 3.872983346 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x = 3.872983346 + 3.5 x = 3.872983346 + 3.5 Combine like terms: 3.872983346 + 3.5 = 7.372983346 x = 7.372983346 Simplifying x = 7.372983346

Subproblem 2

x + -3.5 = -3.872983346 Simplifying x + -3.5 = -3.872983346 Reorder the terms: -3.5 + x = -3.872983346 Solving -3.5 + x = -3.872983346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + x = -3.872983346 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x = -3.872983346 + 3.5 x = -3.872983346 + 3.5 Combine like terms: -3.872983346 + 3.5 = -0.372983346 x = -0.372983346 Simplifying x = -0.372983346

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.372983346, -0.372983346}

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