x^2+4x^2+24x-36=9

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Solution for x^2+4x^2+24x-36=9 equation:


Simplifying
x2 + 4x2 + 24x + -36 = 9

Reorder the terms:
-36 + 24x + x2 + 4x2 = 9

Combine like terms: x2 + 4x2 = 5x2
-36 + 24x + 5x2 = 9

Solving
-36 + 24x + 5x2 = 9

Solving for variable 'x'.

Reorder the terms:
-36 + -9 + 24x + 5x2 = 9 + -9

Combine like terms: -36 + -9 = -45
-45 + 24x + 5x2 = 9 + -9

Combine like terms: 9 + -9 = 0
-45 + 24x + 5x2 = 0

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

Divide each side by '5'.
-9 + 4.8x + x2 = 0

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + 4.8x + 9 + x2 = 0 + 9

Reorder the terms:
-9 + 9 + 4.8x + x2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + 4.8x + x2 = 0 + 9
4.8x + x2 = 0 + 9

Combine like terms: 0 + 9 = 9
4.8x + x2 = 9

The x term is 4.8x.  Take half its coefficient (2.4).
Square it (5.76) and add it to both sides.

Add '5.76' to each side of the equation.
4.8x + 5.76 + x2 = 9 + 5.76

Reorder the terms:
5.76 + 4.8x + x2 = 9 + 5.76

Combine like terms: 9 + 5.76 = 14.76
5.76 + 4.8x + x2 = 14.76

Factor a perfect square on the left side:
(x + 2.4)(x + 2.4) = 14.76

Calculate the square root of the right side: 3.841874542

Break this problem into two subproblems by setting 
(x + 2.4) equal to 3.841874542 and -3.841874542.

Subproblem 1

x + 2.4 = 3.841874542 Simplifying x + 2.4 = 3.841874542 Reorder the terms: 2.4 + x = 3.841874542 Solving 2.4 + x = 3.841874542 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.4' to each side of the equation. 2.4 + -2.4 + x = 3.841874542 + -2.4 Combine like terms: 2.4 + -2.4 = 0.0 0.0 + x = 3.841874542 + -2.4 x = 3.841874542 + -2.4 Combine like terms: 3.841874542 + -2.4 = 1.441874542 x = 1.441874542 Simplifying x = 1.441874542

Subproblem 2

x + 2.4 = -3.841874542 Simplifying x + 2.4 = -3.841874542 Reorder the terms: 2.4 + x = -3.841874542 Solving 2.4 + x = -3.841874542 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.4' to each side of the equation. 2.4 + -2.4 + x = -3.841874542 + -2.4 Combine like terms: 2.4 + -2.4 = 0.0 0.0 + x = -3.841874542 + -2.4 x = -3.841874542 + -2.4 Combine like terms: -3.841874542 + -2.4 = -6.241874542 x = -6.241874542 Simplifying x = -6.241874542

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.441874542, -6.241874542}

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