5x(4+x)=175+x

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Solution for 5x(4+x)=175+x equation:


Simplifying
5x(4 + x) = 175 + x
(4 * 5x + x * 5x) = 175 + x
(20x + 5x2) = 175 + x

Solving
20x + 5x2 = 175 + x

Solving for variable 'x'.

Reorder the terms:
-175 + 20x + -1x + 5x2 = 175 + x + -175 + -1x

Combine like terms: 20x + -1x = 19x
-175 + 19x + 5x2 = 175 + x + -175 + -1x

Reorder the terms:
-175 + 19x + 5x2 = 175 + -175 + x + -1x

Combine like terms: 175 + -175 = 0
-175 + 19x + 5x2 = 0 + x + -1x
-175 + 19x + 5x2 = x + -1x

Combine like terms: x + -1x = 0
-175 + 19x + 5x2 = 0

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

Divide each side by '5'.
-35 + 3.8x + x2 = 0

Move the constant term to the right:

Add '35' to each side of the equation.
-35 + 3.8x + 35 + x2 = 0 + 35

Reorder the terms:
-35 + 35 + 3.8x + x2 = 0 + 35

Combine like terms: -35 + 35 = 0
0 + 3.8x + x2 = 0 + 35
3.8x + x2 = 0 + 35

Combine like terms: 0 + 35 = 35
3.8x + x2 = 35

The x term is 3.8x.  Take half its coefficient (1.9).
Square it (3.61) and add it to both sides.

Add '3.61' to each side of the equation.
3.8x + 3.61 + x2 = 35 + 3.61

Reorder the terms:
3.61 + 3.8x + x2 = 35 + 3.61

Combine like terms: 35 + 3.61 = 38.61
3.61 + 3.8x + x2 = 38.61

Factor a perfect square on the left side:
(x + 1.9)(x + 1.9) = 38.61

Calculate the square root of the right side: 6.213694553

Break this problem into two subproblems by setting 
(x + 1.9) equal to 6.213694553 and -6.213694553.

Subproblem 1

x + 1.9 = 6.213694553 Simplifying x + 1.9 = 6.213694553 Reorder the terms: 1.9 + x = 6.213694553 Solving 1.9 + x = 6.213694553 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.9' to each side of the equation. 1.9 + -1.9 + x = 6.213694553 + -1.9 Combine like terms: 1.9 + -1.9 = 0.0 0.0 + x = 6.213694553 + -1.9 x = 6.213694553 + -1.9 Combine like terms: 6.213694553 + -1.9 = 4.313694553 x = 4.313694553 Simplifying x = 4.313694553

Subproblem 2

x + 1.9 = -6.213694553 Simplifying x + 1.9 = -6.213694553 Reorder the terms: 1.9 + x = -6.213694553 Solving 1.9 + x = -6.213694553 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.9' to each side of the equation. 1.9 + -1.9 + x = -6.213694553 + -1.9 Combine like terms: 1.9 + -1.9 = 0.0 0.0 + x = -6.213694553 + -1.9 x = -6.213694553 + -1.9 Combine like terms: -6.213694553 + -1.9 = -8.113694553 x = -8.113694553 Simplifying x = -8.113694553

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.313694553, -8.113694553}

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