4x^2+11x-72=0

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Solution for 4x^2+11x-72=0 equation:


Simplifying
4x2 + 11x + -72 = 0

Reorder the terms:
-72 + 11x + 4x2 = 0

Solving
-72 + 11x + 4x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
4 the coefficient of the squared term: 

Divide each side by '4'.
-18 + 2.75x + x2 = 0

Move the constant term to the right:

Add '18' to each side of the equation.
-18 + 2.75x + 18 + x2 = 0 + 18

Reorder the terms:
-18 + 18 + 2.75x + x2 = 0 + 18

Combine like terms: -18 + 18 = 0
0 + 2.75x + x2 = 0 + 18
2.75x + x2 = 0 + 18

Combine like terms: 0 + 18 = 18
2.75x + x2 = 18

The x term is 2.75x.  Take half its coefficient (1.375).
Square it (1.890625) and add it to both sides.

Add '1.890625' to each side of the equation.
2.75x + 1.890625 + x2 = 18 + 1.890625

Reorder the terms:
1.890625 + 2.75x + x2 = 18 + 1.890625

Combine like terms: 18 + 1.890625 = 19.890625
1.890625 + 2.75x + x2 = 19.890625

Factor a perfect square on the left side:
(x + 1.375)(x + 1.375) = 19.890625

Calculate the square root of the right side: 4.459890694

Break this problem into two subproblems by setting 
(x + 1.375) equal to 4.459890694 and -4.459890694.

Subproblem 1

x + 1.375 = 4.459890694 Simplifying x + 1.375 = 4.459890694 Reorder the terms: 1.375 + x = 4.459890694 Solving 1.375 + x = 4.459890694 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.375' to each side of the equation. 1.375 + -1.375 + x = 4.459890694 + -1.375 Combine like terms: 1.375 + -1.375 = 0.000 0.000 + x = 4.459890694 + -1.375 x = 4.459890694 + -1.375 Combine like terms: 4.459890694 + -1.375 = 3.084890694 x = 3.084890694 Simplifying x = 3.084890694

Subproblem 2

x + 1.375 = -4.459890694 Simplifying x + 1.375 = -4.459890694 Reorder the terms: 1.375 + x = -4.459890694 Solving 1.375 + x = -4.459890694 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.375' to each side of the equation. 1.375 + -1.375 + x = -4.459890694 + -1.375 Combine like terms: 1.375 + -1.375 = 0.000 0.000 + x = -4.459890694 + -1.375 x = -4.459890694 + -1.375 Combine like terms: -4.459890694 + -1.375 = -5.834890694 x = -5.834890694 Simplifying x = -5.834890694

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.084890694, -5.834890694}

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