5x^2+28x=32

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Solution for 5x^2+28x=32 equation:


Simplifying
5x2 + 28x = 32

Reorder the terms:
28x + 5x2 = 32

Solving
28x + 5x2 = 32

Solving for variable 'x'.

Reorder the terms:
-32 + 28x + 5x2 = 32 + -32

Combine like terms: 32 + -32 = 0
-32 + 28x + 5x2 = 0

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

Divide each side by '5'.
-6.4 + 5.6x + x2 = 0

Move the constant term to the right:

Add '6.4' to each side of the equation.
-6.4 + 5.6x + 6.4 + x2 = 0 + 6.4

Reorder the terms:
-6.4 + 6.4 + 5.6x + x2 = 0 + 6.4

Combine like terms: -6.4 + 6.4 = 0.0
0.0 + 5.6x + x2 = 0 + 6.4
5.6x + x2 = 0 + 6.4

Combine like terms: 0 + 6.4 = 6.4
5.6x + x2 = 6.4

The x term is 5.6x.  Take half its coefficient (2.8).
Square it (7.84) and add it to both sides.

Add '7.84' to each side of the equation.
5.6x + 7.84 + x2 = 6.4 + 7.84

Reorder the terms:
7.84 + 5.6x + x2 = 6.4 + 7.84

Combine like terms: 6.4 + 7.84 = 14.24
7.84 + 5.6x + x2 = 14.24

Factor a perfect square on the left side:
(x + 2.8)(x + 2.8) = 14.24

Calculate the square root of the right side: 3.773592453

Break this problem into two subproblems by setting 
(x + 2.8) equal to 3.773592453 and -3.773592453.

Subproblem 1

x + 2.8 = 3.773592453 Simplifying x + 2.8 = 3.773592453 Reorder the terms: 2.8 + x = 3.773592453 Solving 2.8 + x = 3.773592453 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.8' to each side of the equation. 2.8 + -2.8 + x = 3.773592453 + -2.8 Combine like terms: 2.8 + -2.8 = 0.0 0.0 + x = 3.773592453 + -2.8 x = 3.773592453 + -2.8 Combine like terms: 3.773592453 + -2.8 = 0.973592453 x = 0.973592453 Simplifying x = 0.973592453

Subproblem 2

x + 2.8 = -3.773592453 Simplifying x + 2.8 = -3.773592453 Reorder the terms: 2.8 + x = -3.773592453 Solving 2.8 + x = -3.773592453 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.8' to each side of the equation. 2.8 + -2.8 + x = -3.773592453 + -2.8 Combine like terms: 2.8 + -2.8 = 0.0 0.0 + x = -3.773592453 + -2.8 x = -3.773592453 + -2.8 Combine like terms: -3.773592453 + -2.8 = -6.573592453 x = -6.573592453 Simplifying x = -6.573592453

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.973592453, -6.573592453}

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