(x-5)(x-3)=18

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Solution for (x-5)(x-3)=18 equation:


Simplifying
(x + -5)(x + -3) = 18

Reorder the terms:
(-5 + x)(x + -3) = 18

Reorder the terms:
(-5 + x)(-3 + x) = 18

Multiply (-5 + x) * (-3 + x)
(-5(-3 + x) + x(-3 + x)) = 18
((-3 * -5 + x * -5) + x(-3 + x)) = 18
((15 + -5x) + x(-3 + x)) = 18
(15 + -5x + (-3 * x + x * x)) = 18
(15 + -5x + (-3x + x2)) = 18

Combine like terms: -5x + -3x = -8x
(15 + -8x + x2) = 18

Solving
15 + -8x + x2 = 18

Solving for variable 'x'.

Reorder the terms:
15 + -18 + -8x + x2 = 18 + -18

Combine like terms: 15 + -18 = -3
-3 + -8x + x2 = 18 + -18

Combine like terms: 18 + -18 = 0
-3 + -8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + -8x + 3 + x2 = 0 + 3

Reorder the terms:
-3 + 3 + -8x + x2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -8x + x2 = 0 + 3
-8x + x2 = 0 + 3

Combine like terms: 0 + 3 = 3
-8x + x2 = 3

The x term is -8x.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x + 16 + x2 = 3 + 16

Reorder the terms:
16 + -8x + x2 = 3 + 16

Combine like terms: 3 + 16 = 19
16 + -8x + x2 = 19

Factor a perfect square on the left side:
(x + -4)(x + -4) = 19

Calculate the square root of the right side: 4.358898944

Break this problem into two subproblems by setting 
(x + -4) equal to 4.358898944 and -4.358898944.

Subproblem 1

x + -4 = 4.358898944 Simplifying x + -4 = 4.358898944 Reorder the terms: -4 + x = 4.358898944 Solving -4 + x = 4.358898944 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = 4.358898944 + 4 Combine like terms: -4 + 4 = 0 0 + x = 4.358898944 + 4 x = 4.358898944 + 4 Combine like terms: 4.358898944 + 4 = 8.358898944 x = 8.358898944 Simplifying x = 8.358898944

Subproblem 2

x + -4 = -4.358898944 Simplifying x + -4 = -4.358898944 Reorder the terms: -4 + x = -4.358898944 Solving -4 + x = -4.358898944 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = -4.358898944 + 4 Combine like terms: -4 + 4 = 0 0 + x = -4.358898944 + 4 x = -4.358898944 + 4 Combine like terms: -4.358898944 + 4 = -0.358898944 x = -0.358898944 Simplifying x = -0.358898944

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.358898944, -0.358898944}

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