(4x+9)(x)=360

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Solution for (4x+9)(x)=360 equation:


Simplifying
(4x + 9)(x) = 360

Reorder the terms:
(9 + 4x)(x) = 360

Reorder the terms for easier multiplication:
x(9 + 4x) = 360
(9 * x + 4x * x) = 360
(9x + 4x2) = 360

Solving
9x + 4x2 = 360

Solving for variable 'x'.

Reorder the terms:
-360 + 9x + 4x2 = 360 + -360

Combine like terms: 360 + -360 = 0
-360 + 9x + 4x2 = 0

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

Divide each side by '4'.
-90 + 2.25x + x2 = 0

Move the constant term to the right:

Add '90' to each side of the equation.
-90 + 2.25x + 90 + x2 = 0 + 90

Reorder the terms:
-90 + 90 + 2.25x + x2 = 0 + 90

Combine like terms: -90 + 90 = 0
0 + 2.25x + x2 = 0 + 90
2.25x + x2 = 0 + 90

Combine like terms: 0 + 90 = 90
2.25x + x2 = 90

The x term is 2.25x.  Take half its coefficient (1.125).
Square it (1.265625) and add it to both sides.

Add '1.265625' to each side of the equation.
2.25x + 1.265625 + x2 = 90 + 1.265625

Reorder the terms:
1.265625 + 2.25x + x2 = 90 + 1.265625

Combine like terms: 90 + 1.265625 = 91.265625
1.265625 + 2.25x + x2 = 91.265625

Factor a perfect square on the left side:
(x + 1.125)(x + 1.125) = 91.265625

Calculate the square root of the right side: 9.553304402

Break this problem into two subproblems by setting 
(x + 1.125) equal to 9.553304402 and -9.553304402.

Subproblem 1

x + 1.125 = 9.553304402 Simplifying x + 1.125 = 9.553304402 Reorder the terms: 1.125 + x = 9.553304402 Solving 1.125 + x = 9.553304402 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.125' to each side of the equation. 1.125 + -1.125 + x = 9.553304402 + -1.125 Combine like terms: 1.125 + -1.125 = 0.000 0.000 + x = 9.553304402 + -1.125 x = 9.553304402 + -1.125 Combine like terms: 9.553304402 + -1.125 = 8.428304402 x = 8.428304402 Simplifying x = 8.428304402

Subproblem 2

x + 1.125 = -9.553304402 Simplifying x + 1.125 = -9.553304402 Reorder the terms: 1.125 + x = -9.553304402 Solving 1.125 + x = -9.553304402 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.125' to each side of the equation. 1.125 + -1.125 + x = -9.553304402 + -1.125 Combine like terms: 1.125 + -1.125 = 0.000 0.000 + x = -9.553304402 + -1.125 x = -9.553304402 + -1.125 Combine like terms: -9.553304402 + -1.125 = -10.678304402 x = -10.678304402 Simplifying x = -10.678304402

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.428304402, -10.678304402}

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