w^2-16w=21

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Solution for w^2-16w=21 equation:


Simplifying
w2 + -16w = 21

Reorder the terms:
-16w + w2 = 21

Solving
-16w + w2 = 21

Solving for variable 'w'.

Reorder the terms:
-21 + -16w + w2 = 21 + -21

Combine like terms: 21 + -21 = 0
-21 + -16w + w2 = 0

Begin completing the square.

Move the constant term to the right:

Add '21' to each side of the equation.
-21 + -16w + 21 + w2 = 0 + 21

Reorder the terms:
-21 + 21 + -16w + w2 = 0 + 21

Combine like terms: -21 + 21 = 0
0 + -16w + w2 = 0 + 21
-16w + w2 = 0 + 21

Combine like terms: 0 + 21 = 21
-16w + w2 = 21

The w term is -16w.  Take half its coefficient (-8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
-16w + 64 + w2 = 21 + 64

Reorder the terms:
64 + -16w + w2 = 21 + 64

Combine like terms: 21 + 64 = 85
64 + -16w + w2 = 85

Factor a perfect square on the left side:
(w + -8)(w + -8) = 85

Calculate the square root of the right side: 9.219544457

Break this problem into two subproblems by setting 
(w + -8) equal to 9.219544457 and -9.219544457.

Subproblem 1

w + -8 = 9.219544457 Simplifying w + -8 = 9.219544457 Reorder the terms: -8 + w = 9.219544457 Solving -8 + w = 9.219544457 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + w = 9.219544457 + 8 Combine like terms: -8 + 8 = 0 0 + w = 9.219544457 + 8 w = 9.219544457 + 8 Combine like terms: 9.219544457 + 8 = 17.219544457 w = 17.219544457 Simplifying w = 17.219544457

Subproblem 2

w + -8 = -9.219544457 Simplifying w + -8 = -9.219544457 Reorder the terms: -8 + w = -9.219544457 Solving -8 + w = -9.219544457 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + w = -9.219544457 + 8 Combine like terms: -8 + 8 = 0 0 + w = -9.219544457 + 8 w = -9.219544457 + 8 Combine like terms: -9.219544457 + 8 = -1.219544457 w = -1.219544457 Simplifying w = -1.219544457

Solution

The solution to the problem is based on the solutions from the subproblems. w = {17.219544457, -1.219544457}

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