70.4x-.8x^2=965.6

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Solution for 70.4x-.8x^2=965.6 equation:


Simplifying
70.4x + -0.8x2 = 965.6

Solving
70.4x + -0.8x2 = 965.6

Solving for variable 'x'.

Reorder the terms:
-965.6 + 70.4x + -0.8x2 = 965.6 + -965.6

Combine like terms: 965.6 + -965.6 = 0.0
-965.6 + 70.4x + -0.8x2 = 0.0

Begin completing the square.  Divide all terms by
-0.8 the coefficient of the squared term: 

Divide each side by '-0.8'.
1207 + -88x + x2 = 0

Move the constant term to the right:

Add '-1207' to each side of the equation.
1207 + -88x + -1207 + x2 = 0 + -1207

Reorder the terms:
1207 + -1207 + -88x + x2 = 0 + -1207

Combine like terms: 1207 + -1207 = 0
0 + -88x + x2 = 0 + -1207
-88x + x2 = 0 + -1207

Combine like terms: 0 + -1207 = -1207
-88x + x2 = -1207

The x term is -88x.  Take half its coefficient (-44).
Square it (1936) and add it to both sides.

Add '1936' to each side of the equation.
-88x + 1936 + x2 = -1207 + 1936

Reorder the terms:
1936 + -88x + x2 = -1207 + 1936

Combine like terms: -1207 + 1936 = 729
1936 + -88x + x2 = 729

Factor a perfect square on the left side:
(x + -44)(x + -44) = 729

Calculate the square root of the right side: 27

Break this problem into two subproblems by setting 
(x + -44) equal to 27 and -27.

Subproblem 1

x + -44 = 27 Simplifying x + -44 = 27 Reorder the terms: -44 + x = 27 Solving -44 + x = 27 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '44' to each side of the equation. -44 + 44 + x = 27 + 44 Combine like terms: -44 + 44 = 0 0 + x = 27 + 44 x = 27 + 44 Combine like terms: 27 + 44 = 71 x = 71 Simplifying x = 71

Subproblem 2

x + -44 = -27 Simplifying x + -44 = -27 Reorder the terms: -44 + x = -27 Solving -44 + x = -27 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '44' to each side of the equation. -44 + 44 + x = -27 + 44 Combine like terms: -44 + 44 = 0 0 + x = -27 + 44 x = -27 + 44 Combine like terms: -27 + 44 = 17 x = 17 Simplifying x = 17

Solution

The solution to the problem is based on the solutions from the subproblems. x = {71, 17}

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