7x^2-32x-21=0

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Solution for 7x^2-32x-21=0 equation:


Simplifying
7x2 + -32x + -21 = 0

Reorder the terms:
-21 + -32x + 7x2 = 0

Solving
-21 + -32x + 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'.
-3 + -4.571428571x + x2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + -4.571428571x + 3 + x2 = 0 + 3

Reorder the terms:
-3 + 3 + -4.571428571x + x2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -4.571428571x + x2 = 0 + 3
-4.571428571x + x2 = 0 + 3

Combine like terms: 0 + 3 = 3
-4.571428571x + x2 = 3

The x term is -4.571428571x.  Take half its coefficient (-2.285714286).
Square it (5.224489797) and add it to both sides.

Add '5.224489797' to each side of the equation.
-4.571428571x + 5.224489797 + x2 = 3 + 5.224489797

Reorder the terms:
5.224489797 + -4.571428571x + x2 = 3 + 5.224489797

Combine like terms: 3 + 5.224489797 = 8.224489797
5.224489797 + -4.571428571x + x2 = 8.224489797

Factor a perfect square on the left side:
(x + -2.285714286)(x + -2.285714286) = 8.224489797

Calculate the square root of the right side: 2.867837129

Break this problem into two subproblems by setting 
(x + -2.285714286) equal to 2.867837129 and -2.867837129.

Subproblem 1

x + -2.285714286 = 2.867837129 Simplifying x + -2.285714286 = 2.867837129 Reorder the terms: -2.285714286 + x = 2.867837129 Solving -2.285714286 + x = 2.867837129 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.285714286' to each side of the equation. -2.285714286 + 2.285714286 + x = 2.867837129 + 2.285714286 Combine like terms: -2.285714286 + 2.285714286 = 0.000000000 0.000000000 + x = 2.867837129 + 2.285714286 x = 2.867837129 + 2.285714286 Combine like terms: 2.867837129 + 2.285714286 = 5.153551415 x = 5.153551415 Simplifying x = 5.153551415

Subproblem 2

x + -2.285714286 = -2.867837129 Simplifying x + -2.285714286 = -2.867837129 Reorder the terms: -2.285714286 + x = -2.867837129 Solving -2.285714286 + x = -2.867837129 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.285714286' to each side of the equation. -2.285714286 + 2.285714286 + x = -2.867837129 + 2.285714286 Combine like terms: -2.285714286 + 2.285714286 = 0.000000000 0.000000000 + x = -2.867837129 + 2.285714286 x = -2.867837129 + 2.285714286 Combine like terms: -2.867837129 + 2.285714286 = -0.582122843 x = -0.582122843 Simplifying x = -0.582122843

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.153551415, -0.582122843}

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