8x^2+18x-24=9

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Solution for 8x^2+18x-24=9 equation:


Simplifying
8x2 + 18x + -24 = 9

Reorder the terms:
-24 + 18x + 8x2 = 9

Solving
-24 + 18x + 8x2 = 9

Solving for variable 'x'.

Reorder the terms:
-24 + -9 + 18x + 8x2 = 9 + -9

Combine like terms: -24 + -9 = -33
-33 + 18x + 8x2 = 9 + -9

Combine like terms: 9 + -9 = 0
-33 + 18x + 8x2 = 0

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

Divide each side by '8'.
-4.125 + 2.25x + x2 = 0

Move the constant term to the right:

Add '4.125' to each side of the equation.
-4.125 + 2.25x + 4.125 + x2 = 0 + 4.125

Reorder the terms:
-4.125 + 4.125 + 2.25x + x2 = 0 + 4.125

Combine like terms: -4.125 + 4.125 = 0.000
0.000 + 2.25x + x2 = 0 + 4.125
2.25x + x2 = 0 + 4.125

Combine like terms: 0 + 4.125 = 4.125
2.25x + x2 = 4.125

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 = 4.125 + 1.265625

Reorder the terms:
1.265625 + 2.25x + x2 = 4.125 + 1.265625

Combine like terms: 4.125 + 1.265625 = 5.390625
1.265625 + 2.25x + x2 = 5.390625

Factor a perfect square on the left side:
(x + 1.125)(x + 1.125) = 5.390625

Calculate the square root of the right side: 2.321771953

Break this problem into two subproblems by setting 
(x + 1.125) equal to 2.321771953 and -2.321771953.

Subproblem 1

x + 1.125 = 2.321771953 Simplifying x + 1.125 = 2.321771953 Reorder the terms: 1.125 + x = 2.321771953 Solving 1.125 + x = 2.321771953 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 = 2.321771953 + -1.125 Combine like terms: 1.125 + -1.125 = 0.000 0.000 + x = 2.321771953 + -1.125 x = 2.321771953 + -1.125 Combine like terms: 2.321771953 + -1.125 = 1.196771953 x = 1.196771953 Simplifying x = 1.196771953

Subproblem 2

x + 1.125 = -2.321771953 Simplifying x + 1.125 = -2.321771953 Reorder the terms: 1.125 + x = -2.321771953 Solving 1.125 + x = -2.321771953 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 = -2.321771953 + -1.125 Combine like terms: 1.125 + -1.125 = 0.000 0.000 + x = -2.321771953 + -1.125 x = -2.321771953 + -1.125 Combine like terms: -2.321771953 + -1.125 = -3.446771953 x = -3.446771953 Simplifying x = -3.446771953

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.196771953, -3.446771953}

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