4x^2+3x-2.5=0

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Solution for 4x^2+3x-2.5=0 equation:


Simplifying
4x2 + 3x + -2.5 = 0

Reorder the terms:
-2.5 + 3x + 4x2 = 0

Solving
-2.5 + 3x + 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'.
-0.625 + 0.75x + x2 = 0

Move the constant term to the right:

Add '0.625' to each side of the equation.
-0.625 + 0.75x + 0.625 + x2 = 0 + 0.625

Reorder the terms:
-0.625 + 0.625 + 0.75x + x2 = 0 + 0.625

Combine like terms: -0.625 + 0.625 = 0.000
0.000 + 0.75x + x2 = 0 + 0.625
0.75x + x2 = 0 + 0.625

Combine like terms: 0 + 0.625 = 0.625
0.75x + x2 = 0.625

The x term is 0.75x.  Take half its coefficient (0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
0.75x + 0.140625 + x2 = 0.625 + 0.140625

Reorder the terms:
0.140625 + 0.75x + x2 = 0.625 + 0.140625

Combine like terms: 0.625 + 0.140625 = 0.765625
0.140625 + 0.75x + x2 = 0.765625

Factor a perfect square on the left side:
(x + 0.375)(x + 0.375) = 0.765625

Calculate the square root of the right side: 0.875

Break this problem into two subproblems by setting 
(x + 0.375) equal to 0.875 and -0.875.

Subproblem 1

x + 0.375 = 0.875 Simplifying x + 0.375 = 0.875 Reorder the terms: 0.375 + x = 0.875 Solving 0.375 + x = 0.875 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.375' to each side of the equation. 0.375 + -0.375 + x = 0.875 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + x = 0.875 + -0.375 x = 0.875 + -0.375 Combine like terms: 0.875 + -0.375 = 0.5 x = 0.5 Simplifying x = 0.5

Subproblem 2

x + 0.375 = -0.875 Simplifying x + 0.375 = -0.875 Reorder the terms: 0.375 + x = -0.875 Solving 0.375 + x = -0.875 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.375' to each side of the equation. 0.375 + -0.375 + x = -0.875 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + x = -0.875 + -0.375 x = -0.875 + -0.375 Combine like terms: -0.875 + -0.375 = -1.25 x = -1.25 Simplifying x = -1.25

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.5, -1.25}

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