7(X^2+2)-X=-8X+55

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Solution for 7(X^2+2)-X=-8X+55 equation:


Simplifying
7(X2 + 2) + -1X = -8X + 55

Reorder the terms:
7(2 + X2) + -1X = -8X + 55
(2 * 7 + X2 * 7) + -1X = -8X + 55
(14 + 7X2) + -1X = -8X + 55

Reorder the terms:
14 + -1X + 7X2 = -8X + 55

Reorder the terms:
14 + -1X + 7X2 = 55 + -8X

Solving
14 + -1X + 7X2 = 55 + -8X

Solving for variable 'X'.

Reorder the terms:
14 + -55 + -1X + 8X + 7X2 = 55 + -8X + -55 + 8X

Combine like terms: 14 + -55 = -41
-41 + -1X + 8X + 7X2 = 55 + -8X + -55 + 8X

Combine like terms: -1X + 8X = 7X
-41 + 7X + 7X2 = 55 + -8X + -55 + 8X

Reorder the terms:
-41 + 7X + 7X2 = 55 + -55 + -8X + 8X

Combine like terms: 55 + -55 = 0
-41 + 7X + 7X2 = 0 + -8X + 8X
-41 + 7X + 7X2 = -8X + 8X

Combine like terms: -8X + 8X = 0
-41 + 7X + 7X2 = 0

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

Divide each side by '7'.
-5.857142857 + X + X2 = 0

Move the constant term to the right:

Add '5.857142857' to each side of the equation.
-5.857142857 + X + 5.857142857 + X2 = 0 + 5.857142857

Reorder the terms:
-5.857142857 + 5.857142857 + X + X2 = 0 + 5.857142857

Combine like terms: -5.857142857 + 5.857142857 = 0.000000000
0.000000000 + X + X2 = 0 + 5.857142857
X + X2 = 0 + 5.857142857

Combine like terms: 0 + 5.857142857 = 5.857142857
X + X2 = 5.857142857

The X term is X.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + X2 = 5.857142857 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + X2 = 5.857142857 + 0.25

Combine like terms: 5.857142857 + 0.25 = 6.107142857
1.25 + X2 = 6.107142857

Factor a perfect square on the left side:
(X + 0.5)(X + 0.5) = 6.107142857

Calculate the square root of the right side: 2.471263413

Break this problem into two subproblems by setting 
(X + 0.5) equal to 2.471263413 and -2.471263413.

Subproblem 1

X + 0.5 = 2.471263413 Simplifying X + 0.5 = 2.471263413 Reorder the terms: 0.5 + X = 2.471263413 Solving 0.5 + X = 2.471263413 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + X = 2.471263413 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + X = 2.471263413 + -0.5 X = 2.471263413 + -0.5 Combine like terms: 2.471263413 + -0.5 = 1.971263413 X = 1.971263413 Simplifying X = 1.971263413

Subproblem 2

X + 0.5 = -2.471263413 Simplifying X + 0.5 = -2.471263413 Reorder the terms: 0.5 + X = -2.471263413 Solving 0.5 + X = -2.471263413 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + X = -2.471263413 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + X = -2.471263413 + -0.5 X = -2.471263413 + -0.5 Combine like terms: -2.471263413 + -0.5 = -2.971263413 X = -2.971263413 Simplifying X = -2.971263413

Solution

The solution to the problem is based on the solutions from the subproblems. X = {1.971263413, -2.971263413}

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