.25x^2+3.5x+12=0

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Solution for .25x^2+3.5x+12=0 equation:


Simplifying
0.25x2 + 3.5x + 12 = 0

Reorder the terms:
12 + 3.5x + 0.25x2 = 0

Solving
12 + 3.5x + 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'.
48 + 14x + x2 = 0

Move the constant term to the right:

Add '-48' to each side of the equation.
48 + 14x + -48 + x2 = 0 + -48

Reorder the terms:
48 + -48 + 14x + x2 = 0 + -48

Combine like terms: 48 + -48 = 0
0 + 14x + x2 = 0 + -48
14x + x2 = 0 + -48

Combine like terms: 0 + -48 = -48
14x + x2 = -48

The x term is 14x.  Take half its coefficient (7).
Square it (49) and add it to both sides.

Add '49' to each side of the equation.
14x + 49 + x2 = -48 + 49

Reorder the terms:
49 + 14x + x2 = -48 + 49

Combine like terms: -48 + 49 = 1
49 + 14x + x2 = 1

Factor a perfect square on the left side:
(x + 7)(x + 7) = 1

Calculate the square root of the right side: 1

Break this problem into two subproblems by setting 
(x + 7) equal to 1 and -1.

Subproblem 1

x + 7 = 1 Simplifying x + 7 = 1 Reorder the terms: 7 + x = 1 Solving 7 + x = 1 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + x = 1 + -7 Combine like terms: 7 + -7 = 0 0 + x = 1 + -7 x = 1 + -7 Combine like terms: 1 + -7 = -6 x = -6 Simplifying x = -6

Subproblem 2

x + 7 = -1 Simplifying x + 7 = -1 Reorder the terms: 7 + x = -1 Solving 7 + x = -1 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + x = -1 + -7 Combine like terms: 7 + -7 = 0 0 + x = -1 + -7 x = -1 + -7 Combine like terms: -1 + -7 = -8 x = -8 Simplifying x = -8

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-6, -8}

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