(8+x)(10+x)=152

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Solution for (8+x)(10+x)=152 equation:


Simplifying
(8 + x)(10 + x) = 152

Multiply (8 + x) * (10 + x)
(8(10 + x) + x(10 + x)) = 152
((10 * 8 + x * 8) + x(10 + x)) = 152
((80 + 8x) + x(10 + x)) = 152
(80 + 8x + (10 * x + x * x)) = 152
(80 + 8x + (10x + x2)) = 152

Combine like terms: 8x + 10x = 18x
(80 + 18x + x2) = 152

Solving
80 + 18x + x2 = 152

Solving for variable 'x'.

Reorder the terms:
80 + -152 + 18x + x2 = 152 + -152

Combine like terms: 80 + -152 = -72
-72 + 18x + x2 = 152 + -152

Combine like terms: 152 + -152 = 0
-72 + 18x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '72' to each side of the equation.
-72 + 18x + 72 + x2 = 0 + 72

Reorder the terms:
-72 + 72 + 18x + x2 = 0 + 72

Combine like terms: -72 + 72 = 0
0 + 18x + x2 = 0 + 72
18x + x2 = 0 + 72

Combine like terms: 0 + 72 = 72
18x + x2 = 72

The x term is 18x.  Take half its coefficient (9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
18x + 81 + x2 = 72 + 81

Reorder the terms:
81 + 18x + x2 = 72 + 81

Combine like terms: 72 + 81 = 153
81 + 18x + x2 = 153

Factor a perfect square on the left side:
(x + 9)(x + 9) = 153

Calculate the square root of the right side: 12.369316877

Break this problem into two subproblems by setting 
(x + 9) equal to 12.369316877 and -12.369316877.

Subproblem 1

x + 9 = 12.369316877 Simplifying x + 9 = 12.369316877 Reorder the terms: 9 + x = 12.369316877 Solving 9 + x = 12.369316877 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + x = 12.369316877 + -9 Combine like terms: 9 + -9 = 0 0 + x = 12.369316877 + -9 x = 12.369316877 + -9 Combine like terms: 12.369316877 + -9 = 3.369316877 x = 3.369316877 Simplifying x = 3.369316877

Subproblem 2

x + 9 = -12.369316877 Simplifying x + 9 = -12.369316877 Reorder the terms: 9 + x = -12.369316877 Solving 9 + x = -12.369316877 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + x = -12.369316877 + -9 Combine like terms: 9 + -9 = 0 0 + x = -12.369316877 + -9 x = -12.369316877 + -9 Combine like terms: -12.369316877 + -9 = -21.369316877 x = -21.369316877 Simplifying x = -21.369316877

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.369316877, -21.369316877}

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