5x^2-21x=24

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Solution for 5x^2-21x=24 equation:


Simplifying
5x2 + -21x = 24

Reorder the terms:
-21x + 5x2 = 24

Solving
-21x + 5x2 = 24

Solving for variable 'x'.

Reorder the terms:
-24 + -21x + 5x2 = 24 + -24

Combine like terms: 24 + -24 = 0
-24 + -21x + 5x2 = 0

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

Divide each side by '5'.
-4.8 + -4.2x + x2 = 0

Move the constant term to the right:

Add '4.8' to each side of the equation.
-4.8 + -4.2x + 4.8 + x2 = 0 + 4.8

Reorder the terms:
-4.8 + 4.8 + -4.2x + x2 = 0 + 4.8

Combine like terms: -4.8 + 4.8 = 0.0
0.0 + -4.2x + x2 = 0 + 4.8
-4.2x + x2 = 0 + 4.8

Combine like terms: 0 + 4.8 = 4.8
-4.2x + x2 = 4.8

The x term is -4.2x.  Take half its coefficient (-2.1).
Square it (4.41) and add it to both sides.

Add '4.41' to each side of the equation.
-4.2x + 4.41 + x2 = 4.8 + 4.41

Reorder the terms:
4.41 + -4.2x + x2 = 4.8 + 4.41

Combine like terms: 4.8 + 4.41 = 9.21
4.41 + -4.2x + x2 = 9.21

Factor a perfect square on the left side:
(x + -2.1)(x + -2.1) = 9.21

Calculate the square root of the right side: 3.034798181

Break this problem into two subproblems by setting 
(x + -2.1) equal to 3.034798181 and -3.034798181.

Subproblem 1

x + -2.1 = 3.034798181 Simplifying x + -2.1 = 3.034798181 Reorder the terms: -2.1 + x = 3.034798181 Solving -2.1 + x = 3.034798181 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.1' to each side of the equation. -2.1 + 2.1 + x = 3.034798181 + 2.1 Combine like terms: -2.1 + 2.1 = 0.0 0.0 + x = 3.034798181 + 2.1 x = 3.034798181 + 2.1 Combine like terms: 3.034798181 + 2.1 = 5.134798181 x = 5.134798181 Simplifying x = 5.134798181

Subproblem 2

x + -2.1 = -3.034798181 Simplifying x + -2.1 = -3.034798181 Reorder the terms: -2.1 + x = -3.034798181 Solving -2.1 + x = -3.034798181 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.1' to each side of the equation. -2.1 + 2.1 + x = -3.034798181 + 2.1 Combine like terms: -2.1 + 2.1 = 0.0 0.0 + x = -3.034798181 + 2.1 x = -3.034798181 + 2.1 Combine like terms: -3.034798181 + 2.1 = -0.934798181 x = -0.934798181 Simplifying x = -0.934798181

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.134798181, -0.934798181}

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