10w^2-3w-77=0

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Solution for 10w^2-3w-77=0 equation:


Simplifying
10w2 + -3w + -77 = 0

Reorder the terms:
-77 + -3w + 10w2 = 0

Solving
-77 + -3w + 10w2 = 0

Solving for variable 'w'.

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

Divide each side by '10'.
-7.7 + -0.3w + w2 = 0

Move the constant term to the right:

Add '7.7' to each side of the equation.
-7.7 + -0.3w + 7.7 + w2 = 0 + 7.7

Reorder the terms:
-7.7 + 7.7 + -0.3w + w2 = 0 + 7.7

Combine like terms: -7.7 + 7.7 = 0.0
0.0 + -0.3w + w2 = 0 + 7.7
-0.3w + w2 = 0 + 7.7

Combine like terms: 0 + 7.7 = 7.7
-0.3w + w2 = 7.7

The w term is -0.3w.  Take half its coefficient (-0.15).
Square it (0.0225) and add it to both sides.

Add '0.0225' to each side of the equation.
-0.3w + 0.0225 + w2 = 7.7 + 0.0225

Reorder the terms:
0.0225 + -0.3w + w2 = 7.7 + 0.0225

Combine like terms: 7.7 + 0.0225 = 7.7225
0.0225 + -0.3w + w2 = 7.7225

Factor a perfect square on the left side:
(w + -0.15)(w + -0.15) = 7.7225

Calculate the square root of the right side: 2.778938646

Break this problem into two subproblems by setting 
(w + -0.15) equal to 2.778938646 and -2.778938646.

Subproblem 1

w + -0.15 = 2.778938646 Simplifying w + -0.15 = 2.778938646 Reorder the terms: -0.15 + w = 2.778938646 Solving -0.15 + w = 2.778938646 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '0.15' to each side of the equation. -0.15 + 0.15 + w = 2.778938646 + 0.15 Combine like terms: -0.15 + 0.15 = 0.00 0.00 + w = 2.778938646 + 0.15 w = 2.778938646 + 0.15 Combine like terms: 2.778938646 + 0.15 = 2.928938646 w = 2.928938646 Simplifying w = 2.928938646

Subproblem 2

w + -0.15 = -2.778938646 Simplifying w + -0.15 = -2.778938646 Reorder the terms: -0.15 + w = -2.778938646 Solving -0.15 + w = -2.778938646 Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '0.15' to each side of the equation. -0.15 + 0.15 + w = -2.778938646 + 0.15 Combine like terms: -0.15 + 0.15 = 0.00 0.00 + w = -2.778938646 + 0.15 w = -2.778938646 + 0.15 Combine like terms: -2.778938646 + 0.15 = -2.628938646 w = -2.628938646 Simplifying w = -2.628938646

Solution

The solution to the problem is based on the solutions from the subproblems. w = {2.928938646, -2.628938646}

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