2w^2-8w+7=w^2-4

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Solution for 2w^2-8w+7=w^2-4 equation:


Simplifying
2w2 + -8w + 7 = w2 + -4

Reorder the terms:
7 + -8w + 2w2 = w2 + -4

Reorder the terms:
7 + -8w + 2w2 = -4 + w2

Solving
7 + -8w + 2w2 = -4 + w2

Solving for variable 'w'.

Reorder the terms:
7 + 4 + -8w + 2w2 + -1w2 = -4 + w2 + 4 + -1w2

Combine like terms: 7 + 4 = 11
11 + -8w + 2w2 + -1w2 = -4 + w2 + 4 + -1w2

Combine like terms: 2w2 + -1w2 = 1w2
11 + -8w + 1w2 = -4 + w2 + 4 + -1w2

Reorder the terms:
11 + -8w + 1w2 = -4 + 4 + w2 + -1w2

Combine like terms: -4 + 4 = 0
11 + -8w + 1w2 = 0 + w2 + -1w2
11 + -8w + 1w2 = w2 + -1w2

Combine like terms: w2 + -1w2 = 0
11 + -8w + 1w2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-11' to each side of the equation.
11 + -8w + -11 + w2 = 0 + -11

Reorder the terms:
11 + -11 + -8w + w2 = 0 + -11

Combine like terms: 11 + -11 = 0
0 + -8w + w2 = 0 + -11
-8w + w2 = 0 + -11

Combine like terms: 0 + -11 = -11
-8w + w2 = -11

The w term is -8w.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8w + 16 + w2 = -11 + 16

Reorder the terms:
16 + -8w + w2 = -11 + 16

Combine like terms: -11 + 16 = 5
16 + -8w + w2 = 5

Factor a perfect square on the left side:
(w + -4)(w + -4) = 5

Calculate the square root of the right side: 2.236067978

Break this problem into two subproblems by setting 
(w + -4) equal to 2.236067978 and -2.236067978.

Subproblem 1

w + -4 = 2.236067978 Simplifying w + -4 = 2.236067978 Reorder the terms: -4 + w = 2.236067978 Solving -4 + w = 2.236067978 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + w = 2.236067978 + 4 Combine like terms: -4 + 4 = 0 0 + w = 2.236067978 + 4 w = 2.236067978 + 4 Combine like terms: 2.236067978 + 4 = 6.236067978 w = 6.236067978 Simplifying w = 6.236067978

Subproblem 2

w + -4 = -2.236067978 Simplifying w + -4 = -2.236067978 Reorder the terms: -4 + w = -2.236067978 Solving -4 + w = -2.236067978 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + w = -2.236067978 + 4 Combine like terms: -4 + 4 = 0 0 + w = -2.236067978 + 4 w = -2.236067978 + 4 Combine like terms: -2.236067978 + 4 = 1.763932022 w = 1.763932022 Simplifying w = 1.763932022

Solution

The solution to the problem is based on the solutions from the subproblems. w = {6.236067978, 1.763932022}

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