(2w-2)(w+4)=7

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Solution for (2w-2)(w+4)=7 equation:


Simplifying
(2w + -2)(w + 4) = 7

Reorder the terms:
(-2 + 2w)(w + 4) = 7

Reorder the terms:
(-2 + 2w)(4 + w) = 7

Multiply (-2 + 2w) * (4 + w)
(-2(4 + w) + 2w * (4 + w)) = 7
((4 * -2 + w * -2) + 2w * (4 + w)) = 7
((-8 + -2w) + 2w * (4 + w)) = 7
(-8 + -2w + (4 * 2w + w * 2w)) = 7
(-8 + -2w + (8w + 2w2)) = 7

Combine like terms: -2w + 8w = 6w
(-8 + 6w + 2w2) = 7

Solving
-8 + 6w + 2w2 = 7

Solving for variable 'w'.

Reorder the terms:
-8 + -7 + 6w + 2w2 = 7 + -7

Combine like terms: -8 + -7 = -15
-15 + 6w + 2w2 = 7 + -7

Combine like terms: 7 + -7 = 0
-15 + 6w + 2w2 = 0

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

Divide each side by '2'.
-7.5 + 3w + w2 = 0

Move the constant term to the right:

Add '7.5' to each side of the equation.
-7.5 + 3w + 7.5 + w2 = 0 + 7.5

Reorder the terms:
-7.5 + 7.5 + 3w + w2 = 0 + 7.5

Combine like terms: -7.5 + 7.5 = 0.0
0.0 + 3w + w2 = 0 + 7.5
3w + w2 = 0 + 7.5

Combine like terms: 0 + 7.5 = 7.5
3w + w2 = 7.5

The w term is 3w.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3w + 2.25 + w2 = 7.5 + 2.25

Reorder the terms:
2.25 + 3w + w2 = 7.5 + 2.25

Combine like terms: 7.5 + 2.25 = 9.75
2.25 + 3w + w2 = 9.75

Factor a perfect square on the left side:
(w + 1.5)(w + 1.5) = 9.75

Calculate the square root of the right side: 3.122498999

Break this problem into two subproblems by setting 
(w + 1.5) equal to 3.122498999 and -3.122498999.

Subproblem 1

w + 1.5 = 3.122498999 Simplifying w + 1.5 = 3.122498999 Reorder the terms: 1.5 + w = 3.122498999 Solving 1.5 + w = 3.122498999 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + w = 3.122498999 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + w = 3.122498999 + -1.5 w = 3.122498999 + -1.5 Combine like terms: 3.122498999 + -1.5 = 1.622498999 w = 1.622498999 Simplifying w = 1.622498999

Subproblem 2

w + 1.5 = -3.122498999 Simplifying w + 1.5 = -3.122498999 Reorder the terms: 1.5 + w = -3.122498999 Solving 1.5 + w = -3.122498999 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + w = -3.122498999 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + w = -3.122498999 + -1.5 w = -3.122498999 + -1.5 Combine like terms: -3.122498999 + -1.5 = -4.622498999 w = -4.622498999 Simplifying w = -4.622498999

Solution

The solution to the problem is based on the solutions from the subproblems. w = {1.622498999, -4.622498999}

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