x^2+3.5x+2.5x+8.75=0

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Solution for x^2+3.5x+2.5x+8.75=0 equation:


Simplifying
x2 + 3.5x + 2.5x + 8.75 = 0

Reorder the terms:
8.75 + 3.5x + 2.5x + x2 = 0

Combine like terms: 3.5x + 2.5x = 6x
8.75 + 6x + x2 = 0

Solving
8.75 + 6x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-8.75' to each side of the equation.
8.75 + 6x + -8.75 + x2 = 0 + -8.75

Reorder the terms:
8.75 + -8.75 + 6x + x2 = 0 + -8.75

Combine like terms: 8.75 + -8.75 = 0.00
0.00 + 6x + x2 = 0 + -8.75
6x + x2 = 0 + -8.75

Combine like terms: 0 + -8.75 = -8.75
6x + x2 = -8.75

The x term is 6x.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6x + 9 + x2 = -8.75 + 9

Reorder the terms:
9 + 6x + x2 = -8.75 + 9

Combine like terms: -8.75 + 9 = 0.25
9 + 6x + x2 = 0.25

Factor a perfect square on the left side:
(x + 3)(x + 3) = 0.25

Calculate the square root of the right side: 0.5

Break this problem into two subproblems by setting 
(x + 3) equal to 0.5 and -0.5.

Subproblem 1

x + 3 = 0.5 Simplifying x + 3 = 0.5 Reorder the terms: 3 + x = 0.5 Solving 3 + x = 0.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 0.5 + -3 Combine like terms: 3 + -3 = 0 0 + x = 0.5 + -3 x = 0.5 + -3 Combine like terms: 0.5 + -3 = -2.5 x = -2.5 Simplifying x = -2.5

Subproblem 2

x + 3 = -0.5 Simplifying x + 3 = -0.5 Reorder the terms: 3 + x = -0.5 Solving 3 + x = -0.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = -0.5 + -3 Combine like terms: 3 + -3 = 0 0 + x = -0.5 + -3 x = -0.5 + -3 Combine like terms: -0.5 + -3 = -3.5 x = -3.5 Simplifying x = -3.5

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-2.5, -3.5}

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