4x^2-14x-8=9

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Solution for 4x^2-14x-8=9 equation:


Simplifying
4x2 + -14x + -8 = 9

Reorder the terms:
-8 + -14x + 4x2 = 9

Solving
-8 + -14x + 4x2 = 9

Solving for variable 'x'.

Reorder the terms:
-8 + -9 + -14x + 4x2 = 9 + -9

Combine like terms: -8 + -9 = -17
-17 + -14x + 4x2 = 9 + -9

Combine like terms: 9 + -9 = 0
-17 + -14x + 4x2 = 0

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

Divide each side by '4'.
-4.25 + -3.5x + x2 = 0

Move the constant term to the right:

Add '4.25' to each side of the equation.
-4.25 + -3.5x + 4.25 + x2 = 0 + 4.25

Reorder the terms:
-4.25 + 4.25 + -3.5x + x2 = 0 + 4.25

Combine like terms: -4.25 + 4.25 = 0.00
0.00 + -3.5x + x2 = 0 + 4.25
-3.5x + x2 = 0 + 4.25

Combine like terms: 0 + 4.25 = 4.25
-3.5x + x2 = 4.25

The x term is -3.5x.  Take half its coefficient (-1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
-3.5x + 3.0625 + x2 = 4.25 + 3.0625

Reorder the terms:
3.0625 + -3.5x + x2 = 4.25 + 3.0625

Combine like terms: 4.25 + 3.0625 = 7.3125
3.0625 + -3.5x + x2 = 7.3125

Factor a perfect square on the left side:
(x + -1.75)(x + -1.75) = 7.3125

Calculate the square root of the right side: 2.704163457

Break this problem into two subproblems by setting 
(x + -1.75) equal to 2.704163457 and -2.704163457.

Subproblem 1

x + -1.75 = 2.704163457 Simplifying x + -1.75 = 2.704163457 Reorder the terms: -1.75 + x = 2.704163457 Solving -1.75 + x = 2.704163457 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = 2.704163457 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = 2.704163457 + 1.75 x = 2.704163457 + 1.75 Combine like terms: 2.704163457 + 1.75 = 4.454163457 x = 4.454163457 Simplifying x = 4.454163457

Subproblem 2

x + -1.75 = -2.704163457 Simplifying x + -1.75 = -2.704163457 Reorder the terms: -1.75 + x = -2.704163457 Solving -1.75 + x = -2.704163457 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = -2.704163457 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = -2.704163457 + 1.75 x = -2.704163457 + 1.75 Combine like terms: -2.704163457 + 1.75 = -0.954163457 x = -0.954163457 Simplifying x = -0.954163457

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.454163457, -0.954163457}

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