5x^2+42x-32=0

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Solution for 5x^2+42x-32=0 equation:


Simplifying
5x2 + 42x + -32 = 0

Reorder the terms:
-32 + 42x + 5x2 = 0

Solving
-32 + 42x + 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'.
-6.4 + 8.4x + x2 = 0

Move the constant term to the right:

Add '6.4' to each side of the equation.
-6.4 + 8.4x + 6.4 + x2 = 0 + 6.4

Reorder the terms:
-6.4 + 6.4 + 8.4x + x2 = 0 + 6.4

Combine like terms: -6.4 + 6.4 = 0.0
0.0 + 8.4x + x2 = 0 + 6.4
8.4x + x2 = 0 + 6.4

Combine like terms: 0 + 6.4 = 6.4
8.4x + x2 = 6.4

The x term is 8.4x.  Take half its coefficient (4.2).
Square it (17.64) and add it to both sides.

Add '17.64' to each side of the equation.
8.4x + 17.64 + x2 = 6.4 + 17.64

Reorder the terms:
17.64 + 8.4x + x2 = 6.4 + 17.64

Combine like terms: 6.4 + 17.64 = 24.04
17.64 + 8.4x + x2 = 24.04

Factor a perfect square on the left side:
(x + 4.2)(x + 4.2) = 24.04

Calculate the square root of the right side: 4.903060269

Break this problem into two subproblems by setting 
(x + 4.2) equal to 4.903060269 and -4.903060269.

Subproblem 1

x + 4.2 = 4.903060269 Simplifying x + 4.2 = 4.903060269 Reorder the terms: 4.2 + x = 4.903060269 Solving 4.2 + x = 4.903060269 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.2' to each side of the equation. 4.2 + -4.2 + x = 4.903060269 + -4.2 Combine like terms: 4.2 + -4.2 = 0.0 0.0 + x = 4.903060269 + -4.2 x = 4.903060269 + -4.2 Combine like terms: 4.903060269 + -4.2 = 0.703060269 x = 0.703060269 Simplifying x = 0.703060269

Subproblem 2

x + 4.2 = -4.903060269 Simplifying x + 4.2 = -4.903060269 Reorder the terms: 4.2 + x = -4.903060269 Solving 4.2 + x = -4.903060269 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.2' to each side of the equation. 4.2 + -4.2 + x = -4.903060269 + -4.2 Combine like terms: 4.2 + -4.2 = 0.0 0.0 + x = -4.903060269 + -4.2 x = -4.903060269 + -4.2 Combine like terms: -4.903060269 + -4.2 = -9.103060269 x = -9.103060269 Simplifying x = -9.103060269

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.703060269, -9.103060269}

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