10x^2-70x-63=0

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Solution for 10x^2-70x-63=0 equation:


Simplifying
10x2 + -70x + -63 = 0

Reorder the terms:
-63 + -70x + 10x2 = 0

Solving
-63 + -70x + 10x2 = 0

Solving for variable 'x'.

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

Divide each side by '10'.
-6.3 + -7x + x2 = 0

Move the constant term to the right:

Add '6.3' to each side of the equation.
-6.3 + -7x + 6.3 + x2 = 0 + 6.3

Reorder the terms:
-6.3 + 6.3 + -7x + x2 = 0 + 6.3

Combine like terms: -6.3 + 6.3 = 0.0
0.0 + -7x + x2 = 0 + 6.3
-7x + x2 = 0 + 6.3

Combine like terms: 0 + 6.3 = 6.3
-7x + x2 = 6.3

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 = 6.3 + 12.25

Reorder the terms:
12.25 + -7x + x2 = 6.3 + 12.25

Combine like terms: 6.3 + 12.25 = 18.55
12.25 + -7x + x2 = 18.55

Factor a perfect square on the left side:
(x + -3.5)(x + -3.5) = 18.55

Calculate the square root of the right side: 4.306971093

Break this problem into two subproblems by setting 
(x + -3.5) equal to 4.306971093 and -4.306971093.

Subproblem 1

x + -3.5 = 4.306971093 Simplifying x + -3.5 = 4.306971093 Reorder the terms: -3.5 + x = 4.306971093 Solving -3.5 + x = 4.306971093 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 = 4.306971093 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x = 4.306971093 + 3.5 x = 4.306971093 + 3.5 Combine like terms: 4.306971093 + 3.5 = 7.806971093 x = 7.806971093 Simplifying x = 7.806971093

Subproblem 2

x + -3.5 = -4.306971093 Simplifying x + -3.5 = -4.306971093 Reorder the terms: -3.5 + x = -4.306971093 Solving -3.5 + x = -4.306971093 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 = -4.306971093 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x = -4.306971093 + 3.5 x = -4.306971093 + 3.5 Combine like terms: -4.306971093 + 3.5 = -0.806971093 x = -0.806971093 Simplifying x = -0.806971093

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.806971093, -0.806971093}

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