(x-3)(x-3)=80

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Solution for (x-3)(x-3)=80 equation:


Simplifying
(x + -3)(x + -3) = 80

Reorder the terms:
(-3 + x)(x + -3) = 80

Reorder the terms:
(-3 + x)(-3 + x) = 80

Multiply (-3 + x) * (-3 + x)
(-3(-3 + x) + x(-3 + x)) = 80
((-3 * -3 + x * -3) + x(-3 + x)) = 80
((9 + -3x) + x(-3 + x)) = 80
(9 + -3x + (-3 * x + x * x)) = 80
(9 + -3x + (-3x + x2)) = 80

Combine like terms: -3x + -3x = -6x
(9 + -6x + x2) = 80

Solving
9 + -6x + x2 = 80

Solving for variable 'x'.

Reorder the terms:
9 + -80 + -6x + x2 = 80 + -80

Combine like terms: 9 + -80 = -71
-71 + -6x + x2 = 80 + -80

Combine like terms: 80 + -80 = 0
-71 + -6x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '71' to each side of the equation.
-71 + -6x + 71 + x2 = 0 + 71

Reorder the terms:
-71 + 71 + -6x + x2 = 0 + 71

Combine like terms: -71 + 71 = 0
0 + -6x + x2 = 0 + 71
-6x + x2 = 0 + 71

Combine like terms: 0 + 71 = 71
-6x + x2 = 71

The x term is -6x.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6x + 9 + x2 = 71 + 9

Reorder the terms:
9 + -6x + x2 = 71 + 9

Combine like terms: 71 + 9 = 80
9 + -6x + x2 = 80

Factor a perfect square on the left side:
(x + -3)(x + -3) = 80

Calculate the square root of the right side: 8.94427191

Break this problem into two subproblems by setting 
(x + -3) equal to 8.94427191 and -8.94427191.

Subproblem 1

x + -3 = 8.94427191 Simplifying x + -3 = 8.94427191 Reorder the terms: -3 + x = 8.94427191 Solving -3 + x = 8.94427191 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = 8.94427191 + 3 Combine like terms: -3 + 3 = 0 0 + x = 8.94427191 + 3 x = 8.94427191 + 3 Combine like terms: 8.94427191 + 3 = 11.94427191 x = 11.94427191 Simplifying x = 11.94427191

Subproblem 2

x + -3 = -8.94427191 Simplifying x + -3 = -8.94427191 Reorder the terms: -3 + x = -8.94427191 Solving -3 + x = -8.94427191 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = -8.94427191 + 3 Combine like terms: -3 + 3 = 0 0 + x = -8.94427191 + 3 x = -8.94427191 + 3 Combine like terms: -8.94427191 + 3 = -5.94427191 x = -5.94427191 Simplifying x = -5.94427191

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.94427191, -5.94427191}

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