4x^2-24x-21=0

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Solution for 4x^2-24x-21=0 equation:


Simplifying
4x2 + -24x + -21 = 0

Reorder the terms:
-21 + -24x + 4x2 = 0

Solving
-21 + -24x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
-5.25 + -6x + x2 = 0

Move the constant term to the right:

Add '5.25' to each side of the equation.
-5.25 + -6x + 5.25 + x2 = 0 + 5.25

Reorder the terms:
-5.25 + 5.25 + -6x + x2 = 0 + 5.25

Combine like terms: -5.25 + 5.25 = 0.00
0.00 + -6x + x2 = 0 + 5.25
-6x + x2 = 0 + 5.25

Combine like terms: 0 + 5.25 = 5.25
-6x + x2 = 5.25

The x term is -6x.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6x + 9 + x2 = 5.25 + 9

Reorder the terms:
9 + -6x + x2 = 5.25 + 9

Combine like terms: 5.25 + 9 = 14.25
9 + -6x + x2 = 14.25

Factor a perfect square on the left side:
(x + -3)(x + -3) = 14.25

Calculate the square root of the right side: 3.774917218

Break this problem into two subproblems by setting 
(x + -3) equal to 3.774917218 and -3.774917218.

Subproblem 1

x + -3 = 3.774917218 Simplifying x + -3 = 3.774917218 Reorder the terms: -3 + x = 3.774917218 Solving -3 + x = 3.774917218 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = 3.774917218 + 3 Combine like terms: -3 + 3 = 0 0 + x = 3.774917218 + 3 x = 3.774917218 + 3 Combine like terms: 3.774917218 + 3 = 6.774917218 x = 6.774917218 Simplifying x = 6.774917218

Subproblem 2

x + -3 = -3.774917218 Simplifying x + -3 = -3.774917218 Reorder the terms: -3 + x = -3.774917218 Solving -3 + x = -3.774917218 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = -3.774917218 + 3 Combine like terms: -3 + 3 = 0 0 + x = -3.774917218 + 3 x = -3.774917218 + 3 Combine like terms: -3.774917218 + 3 = -0.774917218 x = -0.774917218 Simplifying x = -0.774917218

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.774917218, -0.774917218}

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