(30+x)(25+x)=1200

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Solution for (30+x)(25+x)=1200 equation:


Simplifying
(30 + x)(25 + x) = 1200

Multiply (30 + x) * (25 + x)
(30(25 + x) + x(25 + x)) = 1200
((25 * 30 + x * 30) + x(25 + x)) = 1200
((750 + 30x) + x(25 + x)) = 1200
(750 + 30x + (25 * x + x * x)) = 1200
(750 + 30x + (25x + x2)) = 1200

Combine like terms: 30x + 25x = 55x
(750 + 55x + x2) = 1200

Solving
750 + 55x + x2 = 1200

Solving for variable 'x'.

Reorder the terms:
750 + -1200 + 55x + x2 = 1200 + -1200

Combine like terms: 750 + -1200 = -450
-450 + 55x + x2 = 1200 + -1200

Combine like terms: 1200 + -1200 = 0
-450 + 55x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '450' to each side of the equation.
-450 + 55x + 450 + x2 = 0 + 450

Reorder the terms:
-450 + 450 + 55x + x2 = 0 + 450

Combine like terms: -450 + 450 = 0
0 + 55x + x2 = 0 + 450
55x + x2 = 0 + 450

Combine like terms: 0 + 450 = 450
55x + x2 = 450

The x term is 55x.  Take half its coefficient (27.5).
Square it (756.25) and add it to both sides.

Add '756.25' to each side of the equation.
55x + 756.25 + x2 = 450 + 756.25

Reorder the terms:
756.25 + 55x + x2 = 450 + 756.25

Combine like terms: 450 + 756.25 = 1206.25
756.25 + 55x + x2 = 1206.25

Factor a perfect square on the left side:
(x + 27.5)(x + 27.5) = 1206.25

Calculate the square root of the right side: 34.731109974

Break this problem into two subproblems by setting 
(x + 27.5) equal to 34.731109974 and -34.731109974.

Subproblem 1

x + 27.5 = 34.731109974 Simplifying x + 27.5 = 34.731109974 Reorder the terms: 27.5 + x = 34.731109974 Solving 27.5 + x = 34.731109974 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-27.5' to each side of the equation. 27.5 + -27.5 + x = 34.731109974 + -27.5 Combine like terms: 27.5 + -27.5 = 0.0 0.0 + x = 34.731109974 + -27.5 x = 34.731109974 + -27.5 Combine like terms: 34.731109974 + -27.5 = 7.231109974 x = 7.231109974 Simplifying x = 7.231109974

Subproblem 2

x + 27.5 = -34.731109974 Simplifying x + 27.5 = -34.731109974 Reorder the terms: 27.5 + x = -34.731109974 Solving 27.5 + x = -34.731109974 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-27.5' to each side of the equation. 27.5 + -27.5 + x = -34.731109974 + -27.5 Combine like terms: 27.5 + -27.5 = 0.0 0.0 + x = -34.731109974 + -27.5 x = -34.731109974 + -27.5 Combine like terms: -34.731109974 + -27.5 = -62.231109974 x = -62.231109974 Simplifying x = -62.231109974

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.231109974, -62.231109974}

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