3w+21-4w^2=0

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Solution for 3w+21-4w^2=0 equation:


Simplifying
3w + 21 + -4w2 = 0

Reorder the terms:
21 + 3w + -4w2 = 0

Solving
21 + 3w + -4w2 = 0

Solving for variable 'w'.

Begin completing the square.  Divide all terms by
-4 the coefficient of the squared term: 

Divide each side by '-4'.
-5.25 + -0.75w + w2 = 0

Move the constant term to the right:

Add '5.25' to each side of the equation.
-5.25 + -0.75w + 5.25 + w2 = 0 + 5.25

Reorder the terms:
-5.25 + 5.25 + -0.75w + w2 = 0 + 5.25

Combine like terms: -5.25 + 5.25 = 0.00
0.00 + -0.75w + w2 = 0 + 5.25
-0.75w + w2 = 0 + 5.25

Combine like terms: 0 + 5.25 = 5.25
-0.75w + w2 = 5.25

The w term is -0.75w.  Take half its coefficient (-0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
-0.75w + 0.140625 + w2 = 5.25 + 0.140625

Reorder the terms:
0.140625 + -0.75w + w2 = 5.25 + 0.140625

Combine like terms: 5.25 + 0.140625 = 5.390625
0.140625 + -0.75w + w2 = 5.390625

Factor a perfect square on the left side:
(w + -0.375)(w + -0.375) = 5.390625

Calculate the square root of the right side: 2.321771953

Break this problem into two subproblems by setting 
(w + -0.375) equal to 2.321771953 and -2.321771953.

Subproblem 1

w + -0.375 = 2.321771953 Simplifying w + -0.375 = 2.321771953 Reorder the terms: -0.375 + w = 2.321771953 Solving -0.375 + w = 2.321771953 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '0.375' to each side of the equation. -0.375 + 0.375 + w = 2.321771953 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + w = 2.321771953 + 0.375 w = 2.321771953 + 0.375 Combine like terms: 2.321771953 + 0.375 = 2.696771953 w = 2.696771953 Simplifying w = 2.696771953

Subproblem 2

w + -0.375 = -2.321771953 Simplifying w + -0.375 = -2.321771953 Reorder the terms: -0.375 + w = -2.321771953 Solving -0.375 + w = -2.321771953 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '0.375' to each side of the equation. -0.375 + 0.375 + w = -2.321771953 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + w = -2.321771953 + 0.375 w = -2.321771953 + 0.375 Combine like terms: -2.321771953 + 0.375 = -1.946771953 w = -1.946771953 Simplifying w = -1.946771953

Solution

The solution to the problem is based on the solutions from the subproblems. w = {2.696771953, -1.946771953}

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