-7x+46=x^2-16

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Solution for -7x+46=x^2-16 equation:


Simplifying
-7x + 46 = x2 + -16

Reorder the terms:
46 + -7x = x2 + -16

Reorder the terms:
46 + -7x = -16 + x2

Solving
46 + -7x = -16 + x2

Solving for variable 'x'.

Reorder the terms:
46 + 16 + -7x + -1x2 = -16 + x2 + 16 + -1x2

Combine like terms: 46 + 16 = 62
62 + -7x + -1x2 = -16 + x2 + 16 + -1x2

Reorder the terms:
62 + -7x + -1x2 = -16 + 16 + x2 + -1x2

Combine like terms: -16 + 16 = 0
62 + -7x + -1x2 = 0 + x2 + -1x2
62 + -7x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
62 + -7x + -1x2 = 0

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

Divide each side by '-1'.
-62 + 7x + x2 = 0

Move the constant term to the right:

Add '62' to each side of the equation.
-62 + 7x + 62 + x2 = 0 + 62

Reorder the terms:
-62 + 62 + 7x + x2 = 0 + 62

Combine like terms: -62 + 62 = 0
0 + 7x + x2 = 0 + 62
7x + x2 = 0 + 62

Combine like terms: 0 + 62 = 62
7x + x2 = 62

The x term is 7x.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7x + 12.25 + x2 = 62 + 12.25

Reorder the terms:
12.25 + 7x + x2 = 62 + 12.25

Combine like terms: 62 + 12.25 = 74.25
12.25 + 7x + x2 = 74.25

Factor a perfect square on the left side:
(x + 3.5)(x + 3.5) = 74.25

Calculate the square root of the right side: 8.61684397

Break this problem into two subproblems by setting 
(x + 3.5) equal to 8.61684397 and -8.61684397.

Subproblem 1

x + 3.5 = 8.61684397 Simplifying x + 3.5 = 8.61684397 Reorder the terms: 3.5 + x = 8.61684397 Solving 3.5 + x = 8.61684397 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = 8.61684397 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = 8.61684397 + -3.5 x = 8.61684397 + -3.5 Combine like terms: 8.61684397 + -3.5 = 5.11684397 x = 5.11684397 Simplifying x = 5.11684397

Subproblem 2

x + 3.5 = -8.61684397 Simplifying x + 3.5 = -8.61684397 Reorder the terms: 3.5 + x = -8.61684397 Solving 3.5 + x = -8.61684397 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = -8.61684397 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = -8.61684397 + -3.5 x = -8.61684397 + -3.5 Combine like terms: -8.61684397 + -3.5 = -12.11684397 x = -12.11684397 Simplifying x = -12.11684397

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.11684397, -12.11684397}

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