(4x-7)(x+3)=x

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Solution for (4x-7)(x+3)=x equation:


Simplifying
(4x + -7)(x + 3) = x

Reorder the terms:
(-7 + 4x)(x + 3) = x

Reorder the terms:
(-7 + 4x)(3 + x) = x

Multiply (-7 + 4x) * (3 + x)
(-7(3 + x) + 4x * (3 + x)) = x
((3 * -7 + x * -7) + 4x * (3 + x)) = x
((-21 + -7x) + 4x * (3 + x)) = x
(-21 + -7x + (3 * 4x + x * 4x)) = x
(-21 + -7x + (12x + 4x2)) = x

Combine like terms: -7x + 12x = 5x
(-21 + 5x + 4x2) = x

Solving
-21 + 5x + 4x2 = x

Solving for variable 'x'.

Reorder the terms:
-21 + 5x + -1x + 4x2 = x + -1x

Combine like terms: 5x + -1x = 4x
-21 + 4x + 4x2 = x + -1x

Combine like terms: x + -1x = 0
-21 + 4x + 4x2 = 0

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

Divide each side by '4'.
-5.25 + x + x2 = 0

Move the constant term to the right:

Add '5.25' to each side of the equation.
-5.25 + x + 5.25 + x2 = 0 + 5.25

Reorder the terms:
-5.25 + 5.25 + x + x2 = 0 + 5.25

Combine like terms: -5.25 + 5.25 = 0.00
0.00 + x + x2 = 0 + 5.25
x + x2 = 0 + 5.25

Combine like terms: 0 + 5.25 = 5.25
x + x2 = 5.25

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + x2 = 5.25 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 5.25 + 0.25

Combine like terms: 5.25 + 0.25 = 5.5
1.25 + x2 = 5.5

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 5.5

Calculate the square root of the right side: 2.34520788

Break this problem into two subproblems by setting 
(x + 0.5) equal to 2.34520788 and -2.34520788.

Subproblem 1

x + 0.5 = 2.34520788 Simplifying x + 0.5 = 2.34520788 Reorder the terms: 0.5 + x = 2.34520788 Solving 0.5 + x = 2.34520788 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 2.34520788 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 2.34520788 + -0.5 x = 2.34520788 + -0.5 Combine like terms: 2.34520788 + -0.5 = 1.84520788 x = 1.84520788 Simplifying x = 1.84520788

Subproblem 2

x + 0.5 = -2.34520788 Simplifying x + 0.5 = -2.34520788 Reorder the terms: 0.5 + x = -2.34520788 Solving 0.5 + x = -2.34520788 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -2.34520788 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -2.34520788 + -0.5 x = -2.34520788 + -0.5 Combine like terms: -2.34520788 + -0.5 = -2.84520788 x = -2.84520788 Simplifying x = -2.84520788

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.84520788, -2.84520788}

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