2x(4+2x)=400

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Solution for 2x(4+2x)=400 equation:


Simplifying
2x(4 + 2x) = 400
(4 * 2x + 2x * 2x) = 400
(8x + 4x2) = 400

Solving
8x + 4x2 = 400

Solving for variable 'x'.

Reorder the terms:
-400 + 8x + 4x2 = 400 + -400

Combine like terms: 400 + -400 = 0
-400 + 8x + 4x2 = 0

Factor out the Greatest Common Factor (GCF), '4'.
4(-100 + 2x + x2) = 0

Ignore the factor 4.

Subproblem 1

Set the factor '(-100 + 2x + x2)' equal to zero and attempt to solve: Simplifying -100 + 2x + x2 = 0 Solving -100 + 2x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '100' to each side of the equation. -100 + 2x + 100 + x2 = 0 + 100 Reorder the terms: -100 + 100 + 2x + x2 = 0 + 100 Combine like terms: -100 + 100 = 0 0 + 2x + x2 = 0 + 100 2x + x2 = 0 + 100 Combine like terms: 0 + 100 = 100 2x + x2 = 100 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 = 100 + 1 Reorder the terms: 1 + 2x + x2 = 100 + 1 Combine like terms: 100 + 1 = 101 1 + 2x + x2 = 101 Factor a perfect square on the left side: (x + 1)(x + 1) = 101 Calculate the square root of the right side: 10.049875621 Break this problem into two subproblems by setting (x + 1) equal to 10.049875621 and -10.049875621.

Subproblem 1

x + 1 = 10.049875621 Simplifying x + 1 = 10.049875621 Reorder the terms: 1 + x = 10.049875621 Solving 1 + x = 10.049875621 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 = 10.049875621 + -1 Combine like terms: 1 + -1 = 0 0 + x = 10.049875621 + -1 x = 10.049875621 + -1 Combine like terms: 10.049875621 + -1 = 9.049875621 x = 9.049875621 Simplifying x = 9.049875621

Subproblem 2

x + 1 = -10.049875621 Simplifying x + 1 = -10.049875621 Reorder the terms: 1 + x = -10.049875621 Solving 1 + x = -10.049875621 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 = -10.049875621 + -1 Combine like terms: 1 + -1 = 0 0 + x = -10.049875621 + -1 x = -10.049875621 + -1 Combine like terms: -10.049875621 + -1 = -11.049875621 x = -11.049875621 Simplifying x = -11.049875621

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.049875621, -11.049875621}

Solution

x = {9.049875621, -11.049875621}

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