7X^2-16X-63=0

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Solution for 7X^2-16X-63=0 equation:


Simplifying
7X2 + -16X + -63 = 0

Reorder the terms:
-63 + -16X + 7X2 = 0

Solving
-63 + -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'.
-9 + -2.285714286X + X2 = 0

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + -2.285714286X + 9 + X2 = 0 + 9

Reorder the terms:
-9 + 9 + -2.285714286X + X2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -2.285714286X + X2 = 0 + 9
-2.285714286X + X2 = 0 + 9

Combine like terms: 0 + 9 = 9
-2.285714286X + X2 = 9

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 = 9 + 1.306122449

Reorder the terms:
1.306122449 + -2.285714286X + X2 = 9 + 1.306122449

Combine like terms: 9 + 1.306122449 = 10.306122449
1.306122449 + -2.285714286X + X2 = 10.306122449

Factor a perfect square on the left side:
(X + -1.142857143)(X + -1.142857143) = 10.306122449

Calculate the square root of the right side: 3.210315008

Break this problem into two subproblems by setting 
(X + -1.142857143) equal to 3.210315008 and -3.210315008.

Subproblem 1

X + -1.142857143 = 3.210315008 Simplifying X + -1.142857143 = 3.210315008 Reorder the terms: -1.142857143 + X = 3.210315008 Solving -1.142857143 + X = 3.210315008 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 = 3.210315008 + 1.142857143 Combine like terms: -1.142857143 + 1.142857143 = 0.000000000 0.000000000 + X = 3.210315008 + 1.142857143 X = 3.210315008 + 1.142857143 Combine like terms: 3.210315008 + 1.142857143 = 4.353172151 X = 4.353172151 Simplifying X = 4.353172151

Subproblem 2

X + -1.142857143 = -3.210315008 Simplifying X + -1.142857143 = -3.210315008 Reorder the terms: -1.142857143 + X = -3.210315008 Solving -1.142857143 + X = -3.210315008 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 = -3.210315008 + 1.142857143 Combine like terms: -1.142857143 + 1.142857143 = 0.000000000 0.000000000 + X = -3.210315008 + 1.142857143 X = -3.210315008 + 1.142857143 Combine like terms: -3.210315008 + 1.142857143 = -2.067457865 X = -2.067457865 Simplifying X = -2.067457865

Solution

The solution to the problem is based on the solutions from the subproblems. X = {4.353172151, -2.067457865}

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