2x^2+21x+24=

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Solution for 2x^2+21x+24= equation:


Simplifying
2x2 + 21x + 24 = 0

Reorder the terms:
24 + 21x + 2x2 = 0

Solving
24 + 21x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
12 + 10.5x + x2 = 0

Move the constant term to the right:

Add '-12' to each side of the equation.
12 + 10.5x + -12 + x2 = 0 + -12

Reorder the terms:
12 + -12 + 10.5x + x2 = 0 + -12

Combine like terms: 12 + -12 = 0
0 + 10.5x + x2 = 0 + -12
10.5x + x2 = 0 + -12

Combine like terms: 0 + -12 = -12
10.5x + x2 = -12

The x term is 10.5x.  Take half its coefficient (5.25).
Square it (27.5625) and add it to both sides.

Add '27.5625' to each side of the equation.
10.5x + 27.5625 + x2 = -12 + 27.5625

Reorder the terms:
27.5625 + 10.5x + x2 = -12 + 27.5625

Combine like terms: -12 + 27.5625 = 15.5625
27.5625 + 10.5x + x2 = 15.5625

Factor a perfect square on the left side:
(x + 5.25)(x + 5.25) = 15.5625

Calculate the square root of the right side: 3.94493346

Break this problem into two subproblems by setting 
(x + 5.25) equal to 3.94493346 and -3.94493346.

Subproblem 1

x + 5.25 = 3.94493346 Simplifying x + 5.25 = 3.94493346 Reorder the terms: 5.25 + x = 3.94493346 Solving 5.25 + x = 3.94493346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.25' to each side of the equation. 5.25 + -5.25 + x = 3.94493346 + -5.25 Combine like terms: 5.25 + -5.25 = 0.00 0.00 + x = 3.94493346 + -5.25 x = 3.94493346 + -5.25 Combine like terms: 3.94493346 + -5.25 = -1.30506654 x = -1.30506654 Simplifying x = -1.30506654

Subproblem 2

x + 5.25 = -3.94493346 Simplifying x + 5.25 = -3.94493346 Reorder the terms: 5.25 + x = -3.94493346 Solving 5.25 + x = -3.94493346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.25' to each side of the equation. 5.25 + -5.25 + x = -3.94493346 + -5.25 Combine like terms: 5.25 + -5.25 = 0.00 0.00 + x = -3.94493346 + -5.25 x = -3.94493346 + -5.25 Combine like terms: -3.94493346 + -5.25 = -9.19493346 x = -9.19493346 Simplifying x = -9.19493346

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.30506654, -9.19493346}

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