(x+40)(x+20)=600

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Solution for (x+40)(x+20)=600 equation:


Simplifying
(x + 40)(x + 20) = 600

Reorder the terms:
(40 + x)(x + 20) = 600

Reorder the terms:
(40 + x)(20 + x) = 600

Multiply (40 + x) * (20 + x)
(40(20 + x) + x(20 + x)) = 600
((20 * 40 + x * 40) + x(20 + x)) = 600
((800 + 40x) + x(20 + x)) = 600
(800 + 40x + (20 * x + x * x)) = 600
(800 + 40x + (20x + x2)) = 600

Combine like terms: 40x + 20x = 60x
(800 + 60x + x2) = 600

Solving
800 + 60x + x2 = 600

Solving for variable 'x'.

Reorder the terms:
800 + -600 + 60x + x2 = 600 + -600

Combine like terms: 800 + -600 = 200
200 + 60x + x2 = 600 + -600

Combine like terms: 600 + -600 = 0
200 + 60x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-200' to each side of the equation.
200 + 60x + -200 + x2 = 0 + -200

Reorder the terms:
200 + -200 + 60x + x2 = 0 + -200

Combine like terms: 200 + -200 = 0
0 + 60x + x2 = 0 + -200
60x + x2 = 0 + -200

Combine like terms: 0 + -200 = -200
60x + x2 = -200

The x term is 60x.  Take half its coefficient (30).
Square it (900) and add it to both sides.

Add '900' to each side of the equation.
60x + 900 + x2 = -200 + 900

Reorder the terms:
900 + 60x + x2 = -200 + 900

Combine like terms: -200 + 900 = 700
900 + 60x + x2 = 700

Factor a perfect square on the left side:
(x + 30)(x + 30) = 700

Calculate the square root of the right side: 26.457513111

Break this problem into two subproblems by setting 
(x + 30) equal to 26.457513111 and -26.457513111.

Subproblem 1

x + 30 = 26.457513111 Simplifying x + 30 = 26.457513111 Reorder the terms: 30 + x = 26.457513111 Solving 30 + x = 26.457513111 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-30' to each side of the equation. 30 + -30 + x = 26.457513111 + -30 Combine like terms: 30 + -30 = 0 0 + x = 26.457513111 + -30 x = 26.457513111 + -30 Combine like terms: 26.457513111 + -30 = -3.542486889 x = -3.542486889 Simplifying x = -3.542486889

Subproblem 2

x + 30 = -26.457513111 Simplifying x + 30 = -26.457513111 Reorder the terms: 30 + x = -26.457513111 Solving 30 + x = -26.457513111 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-30' to each side of the equation. 30 + -30 + x = -26.457513111 + -30 Combine like terms: 30 + -30 = 0 0 + x = -26.457513111 + -30 x = -26.457513111 + -30 Combine like terms: -26.457513111 + -30 = -56.457513111 x = -56.457513111 Simplifying x = -56.457513111

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-3.542486889, -56.457513111}

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