0=7x^2-24x+15

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Solution for 0=7x^2-24x+15 equation:


Simplifying
0 = 7x2 + -24x + 15

Reorder the terms:
0 = 15 + -24x + 7x2

Solving
0 = 15 + -24x + 7x2

Solving for variable 'x'.

Combine like terms: 0 + -15 = -15
-15 + 24x + -7x2 = 15 + -24x + 7x2 + -15 + 24x + -7x2

Reorder the terms:
-15 + 24x + -7x2 = 15 + -15 + -24x + 24x + 7x2 + -7x2

Combine like terms: 15 + -15 = 0
-15 + 24x + -7x2 = 0 + -24x + 24x + 7x2 + -7x2
-15 + 24x + -7x2 = -24x + 24x + 7x2 + -7x2

Combine like terms: -24x + 24x = 0
-15 + 24x + -7x2 = 0 + 7x2 + -7x2
-15 + 24x + -7x2 = 7x2 + -7x2

Combine like terms: 7x2 + -7x2 = 0
-15 + 24x + -7x2 = 0

Begin completing the square.  Divide all terms by
-7 the coefficient of the squared term: 

Divide each side by '-7'.
2.142857143 + -3.428571429x + x2 = 0

Move the constant term to the right:

Add '-2.142857143' to each side of the equation.
2.142857143 + -3.428571429x + -2.142857143 + x2 = 0 + -2.142857143

Reorder the terms:
2.142857143 + -2.142857143 + -3.428571429x + x2 = 0 + -2.142857143

Combine like terms: 2.142857143 + -2.142857143 = 0.000000000
0.000000000 + -3.428571429x + x2 = 0 + -2.142857143
-3.428571429x + x2 = 0 + -2.142857143

Combine like terms: 0 + -2.142857143 = -2.142857143
-3.428571429x + x2 = -2.142857143

The x term is -3.428571429x.  Take half its coefficient (-1.714285715).
Square it (2.938775513) and add it to both sides.

Add '2.938775513' to each side of the equation.
-3.428571429x + 2.938775513 + x2 = -2.142857143 + 2.938775513

Reorder the terms:
2.938775513 + -3.428571429x + x2 = -2.142857143 + 2.938775513

Combine like terms: -2.142857143 + 2.938775513 = 0.79591837
2.938775513 + -3.428571429x + x2 = 0.79591837

Factor a perfect square on the left side:
(x + -1.714285715)(x + -1.714285715) = 0.79591837

Calculate the square root of the right side: 0.892142573

Break this problem into two subproblems by setting 
(x + -1.714285715) equal to 0.892142573 and -0.892142573.

Subproblem 1

x + -1.714285715 = 0.892142573 Simplifying x + -1.714285715 = 0.892142573 Reorder the terms: -1.714285715 + x = 0.892142573 Solving -1.714285715 + x = 0.892142573 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.714285715' to each side of the equation. -1.714285715 + 1.714285715 + x = 0.892142573 + 1.714285715 Combine like terms: -1.714285715 + 1.714285715 = 0.000000000 0.000000000 + x = 0.892142573 + 1.714285715 x = 0.892142573 + 1.714285715 Combine like terms: 0.892142573 + 1.714285715 = 2.606428288 x = 2.606428288 Simplifying x = 2.606428288

Subproblem 2

x + -1.714285715 = -0.892142573 Simplifying x + -1.714285715 = -0.892142573 Reorder the terms: -1.714285715 + x = -0.892142573 Solving -1.714285715 + x = -0.892142573 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.714285715' to each side of the equation. -1.714285715 + 1.714285715 + x = -0.892142573 + 1.714285715 Combine like terms: -1.714285715 + 1.714285715 = 0.000000000 0.000000000 + x = -0.892142573 + 1.714285715 x = -0.892142573 + 1.714285715 Combine like terms: -0.892142573 + 1.714285715 = 0.822143142 x = 0.822143142 Simplifying x = 0.822143142

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.606428288, 0.822143142}

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