x^2+3.5x+1.5=0

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Solution for x^2+3.5x+1.5=0 equation:


Simplifying
x2 + 3.5x + 1.5 = 0

Reorder the terms:
1.5 + 3.5x + x2 = 0

Solving
1.5 + 3.5x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-1.5' to each side of the equation.
1.5 + 3.5x + -1.5 + x2 = 0 + -1.5

Reorder the terms:
1.5 + -1.5 + 3.5x + x2 = 0 + -1.5

Combine like terms: 1.5 + -1.5 = 0.0
0.0 + 3.5x + x2 = 0 + -1.5
3.5x + x2 = 0 + -1.5

Combine like terms: 0 + -1.5 = -1.5
3.5x + x2 = -1.5

The x term is 3.5x.  Take half its coefficient (1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
3.5x + 3.0625 + x2 = -1.5 + 3.0625

Reorder the terms:
3.0625 + 3.5x + x2 = -1.5 + 3.0625

Combine like terms: -1.5 + 3.0625 = 1.5625
3.0625 + 3.5x + x2 = 1.5625

Factor a perfect square on the left side:
(x + 1.75)(x + 1.75) = 1.5625

Calculate the square root of the right side: 1.25

Break this problem into two subproblems by setting 
(x + 1.75) equal to 1.25 and -1.25.

Subproblem 1

x + 1.75 = 1.25 Simplifying x + 1.75 = 1.25 Reorder the terms: 1.75 + x = 1.25 Solving 1.75 + x = 1.25 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + x = 1.25 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x = 1.25 + -1.75 x = 1.25 + -1.75 Combine like terms: 1.25 + -1.75 = -0.5 x = -0.5 Simplifying x = -0.5

Subproblem 2

x + 1.75 = -1.25 Simplifying x + 1.75 = -1.25 Reorder the terms: 1.75 + x = -1.25 Solving 1.75 + x = -1.25 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + x = -1.25 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x = -1.25 + -1.75 x = -1.25 + -1.75 Combine like terms: -1.25 + -1.75 = -3 x = -3 Simplifying x = -3

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.5, -3}

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