36x+4x^2-72=0

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Solution for 36x+4x^2-72=0 equation:


Simplifying
36x + 4x2 + -72 = 0

Reorder the terms:
-72 + 36x + 4x2 = 0

Solving
-72 + 36x + 4x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '4'.
4(-18 + 9x + x2) = 0

Ignore the factor 4.

Subproblem 1

Set the factor '(-18 + 9x + x2)' equal to zero and attempt to solve: Simplifying -18 + 9x + x2 = 0 Solving -18 + 9x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '18' to each side of the equation. -18 + 9x + 18 + x2 = 0 + 18 Reorder the terms: -18 + 18 + 9x + x2 = 0 + 18 Combine like terms: -18 + 18 = 0 0 + 9x + x2 = 0 + 18 9x + x2 = 0 + 18 Combine like terms: 0 + 18 = 18 9x + x2 = 18 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 = 18 + 20.25 Reorder the terms: 20.25 + 9x + x2 = 18 + 20.25 Combine like terms: 18 + 20.25 = 38.25 20.25 + 9x + x2 = 38.25 Factor a perfect square on the left side: (x + 4.5)(x + 4.5) = 38.25 Calculate the square root of the right side: 6.184658438 Break this problem into two subproblems by setting (x + 4.5) equal to 6.184658438 and -6.184658438.

Subproblem 1

x + 4.5 = 6.184658438 Simplifying x + 4.5 = 6.184658438 Reorder the terms: 4.5 + x = 6.184658438 Solving 4.5 + x = 6.184658438 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 = 6.184658438 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = 6.184658438 + -4.5 x = 6.184658438 + -4.5 Combine like terms: 6.184658438 + -4.5 = 1.684658438 x = 1.684658438 Simplifying x = 1.684658438

Subproblem 2

x + 4.5 = -6.184658438 Simplifying x + 4.5 = -6.184658438 Reorder the terms: 4.5 + x = -6.184658438 Solving 4.5 + x = -6.184658438 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 = -6.184658438 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = -6.184658438 + -4.5 x = -6.184658438 + -4.5 Combine like terms: -6.184658438 + -4.5 = -10.684658438 x = -10.684658438 Simplifying x = -10.684658438

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.684658438, -10.684658438}

Solution

x = {1.684658438, -10.684658438}

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