(5x+15)(x-8)=46

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Solution for (5x+15)(x-8)=46 equation:


Simplifying
(5x + 15)(x + -8) = 46

Reorder the terms:
(15 + 5x)(x + -8) = 46

Reorder the terms:
(15 + 5x)(-8 + x) = 46

Multiply (15 + 5x) * (-8 + x)
(15(-8 + x) + 5x * (-8 + x)) = 46
((-8 * 15 + x * 15) + 5x * (-8 + x)) = 46
((-120 + 15x) + 5x * (-8 + x)) = 46
(-120 + 15x + (-8 * 5x + x * 5x)) = 46
(-120 + 15x + (-40x + 5x2)) = 46

Combine like terms: 15x + -40x = -25x
(-120 + -25x + 5x2) = 46

Solving
-120 + -25x + 5x2 = 46

Solving for variable 'x'.

Reorder the terms:
-120 + -46 + -25x + 5x2 = 46 + -46

Combine like terms: -120 + -46 = -166
-166 + -25x + 5x2 = 46 + -46

Combine like terms: 46 + -46 = 0
-166 + -25x + 5x2 = 0

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

Divide each side by '5'.
-33.2 + -5x + x2 = 0

Move the constant term to the right:

Add '33.2' to each side of the equation.
-33.2 + -5x + 33.2 + x2 = 0 + 33.2

Reorder the terms:
-33.2 + 33.2 + -5x + x2 = 0 + 33.2

Combine like terms: -33.2 + 33.2 = 0.0
0.0 + -5x + x2 = 0 + 33.2
-5x + x2 = 0 + 33.2

Combine like terms: 0 + 33.2 = 33.2
-5x + x2 = 33.2

The x term is -5x.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5x + 6.25 + x2 = 33.2 + 6.25

Reorder the terms:
6.25 + -5x + x2 = 33.2 + 6.25

Combine like terms: 33.2 + 6.25 = 39.45
6.25 + -5x + x2 = 39.45

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 39.45

Calculate the square root of the right side: 6.280923499

Break this problem into two subproblems by setting 
(x + -2.5) equal to 6.280923499 and -6.280923499.

Subproblem 1

x + -2.5 = 6.280923499 Simplifying x + -2.5 = 6.280923499 Reorder the terms: -2.5 + x = 6.280923499 Solving -2.5 + x = 6.280923499 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = 6.280923499 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 6.280923499 + 2.5 x = 6.280923499 + 2.5 Combine like terms: 6.280923499 + 2.5 = 8.780923499 x = 8.780923499 Simplifying x = 8.780923499

Subproblem 2

x + -2.5 = -6.280923499 Simplifying x + -2.5 = -6.280923499 Reorder the terms: -2.5 + x = -6.280923499 Solving -2.5 + x = -6.280923499 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = -6.280923499 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -6.280923499 + 2.5 x = -6.280923499 + 2.5 Combine like terms: -6.280923499 + 2.5 = -3.780923499 x = -3.780923499 Simplifying x = -3.780923499

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.780923499, -3.780923499}

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