7x^2-16x-32=0

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Solution for 7x^2-16x-32=0 equation:


Simplifying
7x2 + -16x + -32 = 0

Reorder the terms:
-32 + -16x + 7x2 = 0

Solving
-32 + -16x + 7x2 = 0

Solving for variable 'x'.

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

Divide each side by '7'.
-4.571428571 + -2.285714286x + x2 = 0

Move the constant term to the right:

Add '4.571428571' to each side of the equation.
-4.571428571 + -2.285714286x + 4.571428571 + x2 = 0 + 4.571428571

Reorder the terms:
-4.571428571 + 4.571428571 + -2.285714286x + x2 = 0 + 4.571428571

Combine like terms: -4.571428571 + 4.571428571 = 0.000000000
0.000000000 + -2.285714286x + x2 = 0 + 4.571428571
-2.285714286x + x2 = 0 + 4.571428571

Combine like terms: 0 + 4.571428571 = 4.571428571
-2.285714286x + x2 = 4.571428571

The x term is -2.285714286x.  Take half its coefficient (-1.142857143).
Square it (1.306122449) and add it to both sides.

Add '1.306122449' to each side of the equation.
-2.285714286x + 1.306122449 + x2 = 4.571428571 + 1.306122449

Reorder the terms:
1.306122449 + -2.285714286x + x2 = 4.571428571 + 1.306122449

Combine like terms: 4.571428571 + 1.306122449 = 5.87755102
1.306122449 + -2.285714286x + x2 = 5.87755102

Factor a perfect square on the left side:
(x + -1.142857143)(x + -1.142857143) = 5.87755102

Calculate the square root of the right side: 2.424366107

Break this problem into two subproblems by setting 
(x + -1.142857143) equal to 2.424366107 and -2.424366107.

Subproblem 1

x + -1.142857143 = 2.424366107 Simplifying x + -1.142857143 = 2.424366107 Reorder the terms: -1.142857143 + x = 2.424366107 Solving -1.142857143 + x = 2.424366107 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.142857143' to each side of the equation. -1.142857143 + 1.142857143 + x = 2.424366107 + 1.142857143 Combine like terms: -1.142857143 + 1.142857143 = 0.000000000 0.000000000 + x = 2.424366107 + 1.142857143 x = 2.424366107 + 1.142857143 Combine like terms: 2.424366107 + 1.142857143 = 3.56722325 x = 3.56722325 Simplifying x = 3.56722325

Subproblem 2

x + -1.142857143 = -2.424366107 Simplifying x + -1.142857143 = -2.424366107 Reorder the terms: -1.142857143 + x = -2.424366107 Solving -1.142857143 + x = -2.424366107 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.142857143' to each side of the equation. -1.142857143 + 1.142857143 + x = -2.424366107 + 1.142857143 Combine like terms: -1.142857143 + 1.142857143 = 0.000000000 0.000000000 + x = -2.424366107 + 1.142857143 x = -2.424366107 + 1.142857143 Combine like terms: -2.424366107 + 1.142857143 = -1.281508964 x = -1.281508964 Simplifying x = -1.281508964

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.56722325, -1.281508964}

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