5x^2+3x-28=0

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Solution for 5x^2+3x-28=0 equation:


Simplifying
5x2 + 3x + -28 = 0

Reorder the terms:
-28 + 3x + 5x2 = 0

Solving
-28 + 3x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-5.6 + 0.6x + x2 = 0

Move the constant term to the right:

Add '5.6' to each side of the equation.
-5.6 + 0.6x + 5.6 + x2 = 0 + 5.6

Reorder the terms:
-5.6 + 5.6 + 0.6x + x2 = 0 + 5.6

Combine like terms: -5.6 + 5.6 = 0.0
0.0 + 0.6x + x2 = 0 + 5.6
0.6x + x2 = 0 + 5.6

Combine like terms: 0 + 5.6 = 5.6
0.6x + x2 = 5.6

The x term is 0.6x.  Take half its coefficient (0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
0.6x + 0.09 + x2 = 5.6 + 0.09

Reorder the terms:
0.09 + 0.6x + x2 = 5.6 + 0.09

Combine like terms: 5.6 + 0.09 = 5.69
0.09 + 0.6x + x2 = 5.69

Factor a perfect square on the left side:
(x + 0.3)(x + 0.3) = 5.69

Calculate the square root of the right side: 2.385372088

Break this problem into two subproblems by setting 
(x + 0.3) equal to 2.385372088 and -2.385372088.

Subproblem 1

x + 0.3 = 2.385372088 Simplifying x + 0.3 = 2.385372088 Reorder the terms: 0.3 + x = 2.385372088 Solving 0.3 + x = 2.385372088 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + x = 2.385372088 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = 2.385372088 + -0.3 x = 2.385372088 + -0.3 Combine like terms: 2.385372088 + -0.3 = 2.085372088 x = 2.085372088 Simplifying x = 2.085372088

Subproblem 2

x + 0.3 = -2.385372088 Simplifying x + 0.3 = -2.385372088 Reorder the terms: 0.3 + x = -2.385372088 Solving 0.3 + x = -2.385372088 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + x = -2.385372088 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = -2.385372088 + -0.3 x = -2.385372088 + -0.3 Combine like terms: -2.385372088 + -0.3 = -2.685372088 x = -2.685372088 Simplifying x = -2.685372088

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.085372088, -2.685372088}

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