4x^2+5x-3.5=0

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Solution for 4x^2+5x-3.5=0 equation:


Simplifying
4x2 + 5x + -3.5 = 0

Reorder the terms:
-3.5 + 5x + 4x2 = 0

Solving
-3.5 + 5x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
-0.875 + 1.25x + x2 = 0

Move the constant term to the right:

Add '0.875' to each side of the equation.
-0.875 + 1.25x + 0.875 + x2 = 0 + 0.875

Reorder the terms:
-0.875 + 0.875 + 1.25x + x2 = 0 + 0.875

Combine like terms: -0.875 + 0.875 = 0.000
0.000 + 1.25x + x2 = 0 + 0.875
1.25x + x2 = 0 + 0.875

Combine like terms: 0 + 0.875 = 0.875
1.25x + x2 = 0.875

The x term is 1.25x.  Take half its coefficient (0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
1.25x + 0.390625 + x2 = 0.875 + 0.390625

Reorder the terms:
0.390625 + 1.25x + x2 = 0.875 + 0.390625

Combine like terms: 0.875 + 0.390625 = 1.265625
0.390625 + 1.25x + x2 = 1.265625

Factor a perfect square on the left side:
(x + 0.625)(x + 0.625) = 1.265625

Calculate the square root of the right side: 1.125

Break this problem into two subproblems by setting 
(x + 0.625) equal to 1.125 and -1.125.

Subproblem 1

x + 0.625 = 1.125 Simplifying x + 0.625 = 1.125 Reorder the terms: 0.625 + x = 1.125 Solving 0.625 + x = 1.125 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + x = 1.125 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = 1.125 + -0.625 x = 1.125 + -0.625 Combine like terms: 1.125 + -0.625 = 0.5 x = 0.5 Simplifying x = 0.5

Subproblem 2

x + 0.625 = -1.125 Simplifying x + 0.625 = -1.125 Reorder the terms: 0.625 + x = -1.125 Solving 0.625 + x = -1.125 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + x = -1.125 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = -1.125 + -0.625 x = -1.125 + -0.625 Combine like terms: -1.125 + -0.625 = -1.75 x = -1.75 Simplifying x = -1.75

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.5, -1.75}

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