240=(4x+5)(x)

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Solution for 240=(4x+5)(x) equation:


Simplifying
240 = (4x + 5)(x)

Reorder the terms:
240 = (5 + 4x)(x)

Reorder the terms for easier multiplication:
240 = x(5 + 4x)
240 = (5 * x + 4x * x)
240 = (5x + 4x2)

Solving
240 = 5x + 4x2

Solving for variable 'x'.

Reorder the terms:
240 + -5x + -4x2 = 5x + -5x + 4x2 + -4x2

Combine like terms: 5x + -5x = 0
240 + -5x + -4x2 = 0 + 4x2 + -4x2
240 + -5x + -4x2 = 4x2 + -4x2

Combine like terms: 4x2 + -4x2 = 0
240 + -5x + -4x2 = 0

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

Divide each side by '-4'.
-60 + 1.25x + x2 = 0

Move the constant term to the right:

Add '60' to each side of the equation.
-60 + 1.25x + 60 + x2 = 0 + 60

Reorder the terms:
-60 + 60 + 1.25x + x2 = 0 + 60

Combine like terms: -60 + 60 = 0
0 + 1.25x + x2 = 0 + 60
1.25x + x2 = 0 + 60

Combine like terms: 0 + 60 = 60
1.25x + x2 = 60

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 = 60 + 0.390625

Reorder the terms:
0.390625 + 1.25x + x2 = 60 + 0.390625

Combine like terms: 60 + 0.390625 = 60.390625
0.390625 + 1.25x + x2 = 60.390625

Factor a perfect square on the left side:
(x + 0.625)(x + 0.625) = 60.390625

Calculate the square root of the right side: 7.771140521

Break this problem into two subproblems by setting 
(x + 0.625) equal to 7.771140521 and -7.771140521.

Subproblem 1

x + 0.625 = 7.771140521 Simplifying x + 0.625 = 7.771140521 Reorder the terms: 0.625 + x = 7.771140521 Solving 0.625 + x = 7.771140521 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 = 7.771140521 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = 7.771140521 + -0.625 x = 7.771140521 + -0.625 Combine like terms: 7.771140521 + -0.625 = 7.146140521 x = 7.146140521 Simplifying x = 7.146140521

Subproblem 2

x + 0.625 = -7.771140521 Simplifying x + 0.625 = -7.771140521 Reorder the terms: 0.625 + x = -7.771140521 Solving 0.625 + x = -7.771140521 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 = -7.771140521 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = -7.771140521 + -0.625 x = -7.771140521 + -0.625 Combine like terms: -7.771140521 + -0.625 = -8.396140521 x = -8.396140521 Simplifying x = -8.396140521

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.146140521, -8.396140521}

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