5x^2-35x-7=0

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Solution for 5x^2-35x-7=0 equation:


Simplifying
5x2 + -35x + -7 = 0

Reorder the terms:
-7 + -35x + 5x2 = 0

Solving
-7 + -35x + 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'.
-1.4 + -7x + x2 = 0

Move the constant term to the right:

Add '1.4' to each side of the equation.
-1.4 + -7x + 1.4 + x2 = 0 + 1.4

Reorder the terms:
-1.4 + 1.4 + -7x + x2 = 0 + 1.4

Combine like terms: -1.4 + 1.4 = 0.0
0.0 + -7x + x2 = 0 + 1.4
-7x + x2 = 0 + 1.4

Combine like terms: 0 + 1.4 = 1.4
-7x + x2 = 1.4

The x term is -7x.  Take half its coefficient (-3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
-7x + 12.25 + x2 = 1.4 + 12.25

Reorder the terms:
12.25 + -7x + x2 = 1.4 + 12.25

Combine like terms: 1.4 + 12.25 = 13.65
12.25 + -7x + x2 = 13.65

Factor a perfect square on the left side:
(x + -3.5)(x + -3.5) = 13.65

Calculate the square root of the right side: 3.69459064

Break this problem into two subproblems by setting 
(x + -3.5) equal to 3.69459064 and -3.69459064.

Subproblem 1

x + -3.5 = 3.69459064 Simplifying x + -3.5 = 3.69459064 Reorder the terms: -3.5 + x = 3.69459064 Solving -3.5 + x = 3.69459064 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + x = 3.69459064 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x = 3.69459064 + 3.5 x = 3.69459064 + 3.5 Combine like terms: 3.69459064 + 3.5 = 7.19459064 x = 7.19459064 Simplifying x = 7.19459064

Subproblem 2

x + -3.5 = -3.69459064 Simplifying x + -3.5 = -3.69459064 Reorder the terms: -3.5 + x = -3.69459064 Solving -3.5 + x = -3.69459064 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + x = -3.69459064 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x = -3.69459064 + 3.5 x = -3.69459064 + 3.5 Combine like terms: -3.69459064 + 3.5 = -0.19459064 x = -0.19459064 Simplifying x = -0.19459064

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.19459064, -0.19459064}

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