4x+1-4=x^2+21x-14

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Solution for 4x+1-4=x^2+21x-14 equation:


Simplifying
4x + 1 + -4 = x2 + 21x + -14

Reorder the terms:
1 + -4 + 4x = x2 + 21x + -14

Combine like terms: 1 + -4 = -3
-3 + 4x = x2 + 21x + -14

Reorder the terms:
-3 + 4x = -14 + 21x + x2

Solving
-3 + 4x = -14 + 21x + x2

Solving for variable 'x'.

Reorder the terms:
-3 + 14 + 4x + -21x + -1x2 = -14 + 21x + x2 + 14 + -21x + -1x2

Combine like terms: -3 + 14 = 11
11 + 4x + -21x + -1x2 = -14 + 21x + x2 + 14 + -21x + -1x2

Combine like terms: 4x + -21x = -17x
11 + -17x + -1x2 = -14 + 21x + x2 + 14 + -21x + -1x2

Reorder the terms:
11 + -17x + -1x2 = -14 + 14 + 21x + -21x + x2 + -1x2

Combine like terms: -14 + 14 = 0
11 + -17x + -1x2 = 0 + 21x + -21x + x2 + -1x2
11 + -17x + -1x2 = 21x + -21x + x2 + -1x2

Combine like terms: 21x + -21x = 0
11 + -17x + -1x2 = 0 + x2 + -1x2
11 + -17x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
11 + -17x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-11 + 17x + x2 = 0

Move the constant term to the right:

Add '11' to each side of the equation.
-11 + 17x + 11 + x2 = 0 + 11

Reorder the terms:
-11 + 11 + 17x + x2 = 0 + 11

Combine like terms: -11 + 11 = 0
0 + 17x + x2 = 0 + 11
17x + x2 = 0 + 11

Combine like terms: 0 + 11 = 11
17x + x2 = 11

The x term is 17x.  Take half its coefficient (8.5).
Square it (72.25) and add it to both sides.

Add '72.25' to each side of the equation.
17x + 72.25 + x2 = 11 + 72.25

Reorder the terms:
72.25 + 17x + x2 = 11 + 72.25

Combine like terms: 11 + 72.25 = 83.25
72.25 + 17x + x2 = 83.25

Factor a perfect square on the left side:
(x + 8.5)(x + 8.5) = 83.25

Calculate the square root of the right side: 9.124143795

Break this problem into two subproblems by setting 
(x + 8.5) equal to 9.124143795 and -9.124143795.

Subproblem 1

x + 8.5 = 9.124143795 Simplifying x + 8.5 = 9.124143795 Reorder the terms: 8.5 + x = 9.124143795 Solving 8.5 + x = 9.124143795 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8.5' to each side of the equation. 8.5 + -8.5 + x = 9.124143795 + -8.5 Combine like terms: 8.5 + -8.5 = 0.0 0.0 + x = 9.124143795 + -8.5 x = 9.124143795 + -8.5 Combine like terms: 9.124143795 + -8.5 = 0.624143795 x = 0.624143795 Simplifying x = 0.624143795

Subproblem 2

x + 8.5 = -9.124143795 Simplifying x + 8.5 = -9.124143795 Reorder the terms: 8.5 + x = -9.124143795 Solving 8.5 + x = -9.124143795 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8.5' to each side of the equation. 8.5 + -8.5 + x = -9.124143795 + -8.5 Combine like terms: 8.5 + -8.5 = 0.0 0.0 + x = -9.124143795 + -8.5 x = -9.124143795 + -8.5 Combine like terms: -9.124143795 + -8.5 = -17.624143795 x = -17.624143795 Simplifying x = -17.624143795

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.624143795, -17.624143795}

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