145=(x+1)(4x+1)

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Solution for 145=(x+1)(4x+1) equation:


Simplifying
145 = (x + 1)(4x + 1)

Reorder the terms:
145 = (1 + x)(4x + 1)

Reorder the terms:
145 = (1 + x)(1 + 4x)

Multiply (1 + x) * (1 + 4x)
145 = (1(1 + 4x) + x(1 + 4x))
145 = ((1 * 1 + 4x * 1) + x(1 + 4x))
145 = ((1 + 4x) + x(1 + 4x))
145 = (1 + 4x + (1 * x + 4x * x))
145 = (1 + 4x + (1x + 4x2))

Combine like terms: 4x + 1x = 5x
145 = (1 + 5x + 4x2)

Solving
145 = 1 + 5x + 4x2

Solving for variable 'x'.

Combine like terms: 145 + -1 = 144
144 + -5x + -4x2 = 1 + 5x + 4x2 + -1 + -5x + -4x2

Reorder the terms:
144 + -5x + -4x2 = 1 + -1 + 5x + -5x + 4x2 + -4x2

Combine like terms: 1 + -1 = 0
144 + -5x + -4x2 = 0 + 5x + -5x + 4x2 + -4x2
144 + -5x + -4x2 = 5x + -5x + 4x2 + -4x2

Combine like terms: 5x + -5x = 0
144 + -5x + -4x2 = 0 + 4x2 + -4x2
144 + -5x + -4x2 = 4x2 + -4x2

Combine like terms: 4x2 + -4x2 = 0
144 + -5x + -4x2 = 0

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

Divide each side by '-4'.
-36 + 1.25x + x2 = 0

Move the constant term to the right:

Add '36' to each side of the equation.
-36 + 1.25x + 36 + x2 = 0 + 36

Reorder the terms:
-36 + 36 + 1.25x + x2 = 0 + 36

Combine like terms: -36 + 36 = 0
0 + 1.25x + x2 = 0 + 36
1.25x + x2 = 0 + 36

Combine like terms: 0 + 36 = 36
1.25x + x2 = 36

The x term is 1.25x.  Take half its coefficient (0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
1.25x + 0.390625 + x2 = 36 + 0.390625

Reorder the terms:
0.390625 + 1.25x + x2 = 36 + 0.390625

Combine like terms: 36 + 0.390625 = 36.390625
0.390625 + 1.25x + x2 = 36.390625

Factor a perfect square on the left side:
(x + 0.625)(x + 0.625) = 36.390625

Calculate the square root of the right side: 6.032464256

Break this problem into two subproblems by setting 
(x + 0.625) equal to 6.032464256 and -6.032464256.

Subproblem 1

x + 0.625 = 6.032464256 Simplifying x + 0.625 = 6.032464256 Reorder the terms: 0.625 + x = 6.032464256 Solving 0.625 + x = 6.032464256 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + x = 6.032464256 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = 6.032464256 + -0.625 x = 6.032464256 + -0.625 Combine like terms: 6.032464256 + -0.625 = 5.407464256 x = 5.407464256 Simplifying x = 5.407464256

Subproblem 2

x + 0.625 = -6.032464256 Simplifying x + 0.625 = -6.032464256 Reorder the terms: 0.625 + x = -6.032464256 Solving 0.625 + x = -6.032464256 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + x = -6.032464256 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = -6.032464256 + -0.625 x = -6.032464256 + -0.625 Combine like terms: -6.032464256 + -0.625 = -6.657464256 x = -6.657464256 Simplifying x = -6.657464256

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.407464256, -6.657464256}

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