0.25x^2+11x+120=0

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Solution for 0.25x^2+11x+120=0 equation:


Simplifying
0.25x2 + 11x + 120 = 0

Reorder the terms:
120 + 11x + 0.25x2 = 0

Solving
120 + 11x + 0.25x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.25'.
480 + 44x + x2 = 0

Move the constant term to the right:

Add '-480' to each side of the equation.
480 + 44x + -480 + x2 = 0 + -480

Reorder the terms:
480 + -480 + 44x + x2 = 0 + -480

Combine like terms: 480 + -480 = 0
0 + 44x + x2 = 0 + -480
44x + x2 = 0 + -480

Combine like terms: 0 + -480 = -480
44x + x2 = -480

The x term is 44x.  Take half its coefficient (22).
Square it (484) and add it to both sides.

Add '484' to each side of the equation.
44x + 484 + x2 = -480 + 484

Reorder the terms:
484 + 44x + x2 = -480 + 484

Combine like terms: -480 + 484 = 4
484 + 44x + x2 = 4

Factor a perfect square on the left side:
(x + 22)(x + 22) = 4

Calculate the square root of the right side: 2

Break this problem into two subproblems by setting 
(x + 22) equal to 2 and -2.

Subproblem 1

x + 22 = 2 Simplifying x + 22 = 2 Reorder the terms: 22 + x = 2 Solving 22 + x = 2 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-22' to each side of the equation. 22 + -22 + x = 2 + -22 Combine like terms: 22 + -22 = 0 0 + x = 2 + -22 x = 2 + -22 Combine like terms: 2 + -22 = -20 x = -20 Simplifying x = -20

Subproblem 2

x + 22 = -2 Simplifying x + 22 = -2 Reorder the terms: 22 + x = -2 Solving 22 + x = -2 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-22' to each side of the equation. 22 + -22 + x = -2 + -22 Combine like terms: 22 + -22 = 0 0 + x = -2 + -22 x = -2 + -22 Combine like terms: -2 + -22 = -24 x = -24 Simplifying x = -24

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-20, -24}

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