5x^2-7=-5x

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Solution for 5x^2-7=-5x equation:


Simplifying
5x2 + -7 = -5x

Reorder the terms:
-7 + 5x2 = -5x

Solving
-7 + 5x2 = -5x

Solving for variable 'x'.

Reorder the terms:
-7 + 5x + 5x2 = -5x + 5x

Combine like terms: -5x + 5x = 0
-7 + 5x + 5x2 = 0

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

Divide each side by '5'.
-1.4 + x + x2 = 0

Move the constant term to the right:

Add '1.4' to each side of the equation.
-1.4 + x + 1.4 + x2 = 0 + 1.4

Reorder the terms:
-1.4 + 1.4 + x + x2 = 0 + 1.4

Combine like terms: -1.4 + 1.4 = 0.0
0.0 + x + x2 = 0 + 1.4
x + x2 = 0 + 1.4

Combine like terms: 0 + 1.4 = 1.4
x + x2 = 1.4

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + x2 = 1.4 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 1.4 + 0.25

Combine like terms: 1.4 + 0.25 = 1.65
1.25 + x2 = 1.65

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 1.65

Calculate the square root of the right side: 1.284523258

Break this problem into two subproblems by setting 
(x + 0.5) equal to 1.284523258 and -1.284523258.

Subproblem 1

x + 0.5 = 1.284523258 Simplifying x + 0.5 = 1.284523258 Reorder the terms: 0.5 + x = 1.284523258 Solving 0.5 + x = 1.284523258 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 1.284523258 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 1.284523258 + -0.5 x = 1.284523258 + -0.5 Combine like terms: 1.284523258 + -0.5 = 0.784523258 x = 0.784523258 Simplifying x = 0.784523258

Subproblem 2

x + 0.5 = -1.284523258 Simplifying x + 0.5 = -1.284523258 Reorder the terms: 0.5 + x = -1.284523258 Solving 0.5 + x = -1.284523258 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -1.284523258 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -1.284523258 + -0.5 x = -1.284523258 + -0.5 Combine like terms: -1.284523258 + -0.5 = -1.784523258 x = -1.784523258 Simplifying x = -1.784523258

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.784523258, -1.784523258}

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