3x^2+24x=71

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Solution for 3x^2+24x=71 equation:


Simplifying
3x2 + 24x = 71

Reorder the terms:
24x + 3x2 = 71

Solving
24x + 3x2 = 71

Solving for variable 'x'.

Reorder the terms:
-71 + 24x + 3x2 = 71 + -71

Combine like terms: 71 + -71 = 0
-71 + 24x + 3x2 = 0

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

Divide each side by '3'.
-23.66666667 + 8x + x2 = 0

Move the constant term to the right:

Add '23.66666667' to each side of the equation.
-23.66666667 + 8x + 23.66666667 + x2 = 0 + 23.66666667

Reorder the terms:
-23.66666667 + 23.66666667 + 8x + x2 = 0 + 23.66666667

Combine like terms: -23.66666667 + 23.66666667 = 0.00000000
0.00000000 + 8x + x2 = 0 + 23.66666667
8x + x2 = 0 + 23.66666667

Combine like terms: 0 + 23.66666667 = 23.66666667
8x + x2 = 23.66666667

The x term is 8x.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8x + 16 + x2 = 23.66666667 + 16

Reorder the terms:
16 + 8x + x2 = 23.66666667 + 16

Combine like terms: 23.66666667 + 16 = 39.66666667
16 + 8x + x2 = 39.66666667

Factor a perfect square on the left side:
(x + 4)(x + 4) = 39.66666667

Calculate the square root of the right side: 6.298147876

Break this problem into two subproblems by setting 
(x + 4) equal to 6.298147876 and -6.298147876.

Subproblem 1

x + 4 = 6.298147876 Simplifying x + 4 = 6.298147876 Reorder the terms: 4 + x = 6.298147876 Solving 4 + x = 6.298147876 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = 6.298147876 + -4 Combine like terms: 4 + -4 = 0 0 + x = 6.298147876 + -4 x = 6.298147876 + -4 Combine like terms: 6.298147876 + -4 = 2.298147876 x = 2.298147876 Simplifying x = 2.298147876

Subproblem 2

x + 4 = -6.298147876 Simplifying x + 4 = -6.298147876 Reorder the terms: 4 + x = -6.298147876 Solving 4 + x = -6.298147876 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = -6.298147876 + -4 Combine like terms: 4 + -4 = 0 0 + x = -6.298147876 + -4 x = -6.298147876 + -4 Combine like terms: -6.298147876 + -4 = -10.298147876 x = -10.298147876 Simplifying x = -10.298147876

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.298147876, -10.298147876}

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