(x+4)(x+5)=17

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Solution for (x+4)(x+5)=17 equation:


Simplifying
(x + 4)(x + 5) = 17

Reorder the terms:
(4 + x)(x + 5) = 17

Reorder the terms:
(4 + x)(5 + x) = 17

Multiply (4 + x) * (5 + x)
(4(5 + x) + x(5 + x)) = 17
((5 * 4 + x * 4) + x(5 + x)) = 17
((20 + 4x) + x(5 + x)) = 17
(20 + 4x + (5 * x + x * x)) = 17
(20 + 4x + (5x + x2)) = 17

Combine like terms: 4x + 5x = 9x
(20 + 9x + x2) = 17

Solving
20 + 9x + x2 = 17

Solving for variable 'x'.

Reorder the terms:
20 + -17 + 9x + x2 = 17 + -17

Combine like terms: 20 + -17 = 3
3 + 9x + x2 = 17 + -17

Combine like terms: 17 + -17 = 0
3 + 9x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-3' to each side of the equation.
3 + 9x + -3 + x2 = 0 + -3

Reorder the terms:
3 + -3 + 9x + x2 = 0 + -3

Combine like terms: 3 + -3 = 0
0 + 9x + x2 = 0 + -3
9x + x2 = 0 + -3

Combine like terms: 0 + -3 = -3
9x + x2 = -3

The x term is 9x.  Take half its coefficient (4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
9x + 20.25 + x2 = -3 + 20.25

Reorder the terms:
20.25 + 9x + x2 = -3 + 20.25

Combine like terms: -3 + 20.25 = 17.25
20.25 + 9x + x2 = 17.25

Factor a perfect square on the left side:
(x + 4.5)(x + 4.5) = 17.25

Calculate the square root of the right side: 4.153311931

Break this problem into two subproblems by setting 
(x + 4.5) equal to 4.153311931 and -4.153311931.

Subproblem 1

x + 4.5 = 4.153311931 Simplifying x + 4.5 = 4.153311931 Reorder the terms: 4.5 + x = 4.153311931 Solving 4.5 + x = 4.153311931 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = 4.153311931 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = 4.153311931 + -4.5 x = 4.153311931 + -4.5 Combine like terms: 4.153311931 + -4.5 = -0.346688069 x = -0.346688069 Simplifying x = -0.346688069

Subproblem 2

x + 4.5 = -4.153311931 Simplifying x + 4.5 = -4.153311931 Reorder the terms: 4.5 + x = -4.153311931 Solving 4.5 + x = -4.153311931 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = -4.153311931 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = -4.153311931 + -4.5 x = -4.153311931 + -4.5 Combine like terms: -4.153311931 + -4.5 = -8.653311931 x = -8.653311931 Simplifying x = -8.653311931

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.346688069, -8.653311931}

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