5x(x-2)=80

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Solution for 5x(x-2)=80 equation:


Simplifying
5x(x + -2) = 80

Reorder the terms:
5x(-2 + x) = 80
(-2 * 5x + x * 5x) = 80
(-10x + 5x2) = 80

Solving
-10x + 5x2 = 80

Solving for variable 'x'.

Reorder the terms:
-80 + -10x + 5x2 = 80 + -80

Combine like terms: 80 + -80 = 0
-80 + -10x + 5x2 = 0

Factor out the Greatest Common Factor (GCF), '5'.
5(-16 + -2x + x2) = 0

Ignore the factor 5.

Subproblem 1

Set the factor '(-16 + -2x + x2)' equal to zero and attempt to solve: Simplifying -16 + -2x + x2 = 0 Solving -16 + -2x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '16' to each side of the equation. -16 + -2x + 16 + x2 = 0 + 16 Reorder the terms: -16 + 16 + -2x + x2 = 0 + 16 Combine like terms: -16 + 16 = 0 0 + -2x + x2 = 0 + 16 -2x + x2 = 0 + 16 Combine like terms: 0 + 16 = 16 -2x + x2 = 16 The x term is -2x. Take half its coefficient (-1). Square it (1) and add it to both sides. Add '1' to each side of the equation. -2x + 1 + x2 = 16 + 1 Reorder the terms: 1 + -2x + x2 = 16 + 1 Combine like terms: 16 + 1 = 17 1 + -2x + x2 = 17 Factor a perfect square on the left side: (x + -1)(x + -1) = 17 Calculate the square root of the right side: 4.123105626 Break this problem into two subproblems by setting (x + -1) equal to 4.123105626 and -4.123105626.

Subproblem 1

x + -1 = 4.123105626 Simplifying x + -1 = 4.123105626 Reorder the terms: -1 + x = 4.123105626 Solving -1 + x = 4.123105626 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 4.123105626 + 1 Combine like terms: -1 + 1 = 0 0 + x = 4.123105626 + 1 x = 4.123105626 + 1 Combine like terms: 4.123105626 + 1 = 5.123105626 x = 5.123105626 Simplifying x = 5.123105626

Subproblem 2

x + -1 = -4.123105626 Simplifying x + -1 = -4.123105626 Reorder the terms: -1 + x = -4.123105626 Solving -1 + x = -4.123105626 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -4.123105626 + 1 Combine like terms: -1 + 1 = 0 0 + x = -4.123105626 + 1 x = -4.123105626 + 1 Combine like terms: -4.123105626 + 1 = -3.123105626 x = -3.123105626 Simplifying x = -3.123105626

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.123105626, -3.123105626}

Solution

x = {5.123105626, -3.123105626}

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