=9x^2-64x-25

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Solution for =9x^2-64x-25 equation:


Simplifying
0 = 9x2 + -64x + -25

Reorder the terms:
0 = -25 + -64x + 9x2

Solving
0 = -25 + -64x + 9x2

Solving for variable 'x'.

Combine like terms: 0 + 25 = 25
25 + 64x + -9x2 = -25 + -64x + 9x2 + 25 + 64x + -9x2

Reorder the terms:
25 + 64x + -9x2 = -25 + 25 + -64x + 64x + 9x2 + -9x2

Combine like terms: -25 + 25 = 0
25 + 64x + -9x2 = 0 + -64x + 64x + 9x2 + -9x2
25 + 64x + -9x2 = -64x + 64x + 9x2 + -9x2

Combine like terms: -64x + 64x = 0
25 + 64x + -9x2 = 0 + 9x2 + -9x2
25 + 64x + -9x2 = 9x2 + -9x2

Combine like terms: 9x2 + -9x2 = 0
25 + 64x + -9x2 = 0

Begin completing the square.  Divide all terms by
-9 the coefficient of the squared term: 

Divide each side by '-9'.
-2.777777778 + -7.111111111x + x2 = 0

Move the constant term to the right:

Add '2.777777778' to each side of the equation.
-2.777777778 + -7.111111111x + 2.777777778 + x2 = 0 + 2.777777778

Reorder the terms:
-2.777777778 + 2.777777778 + -7.111111111x + x2 = 0 + 2.777777778

Combine like terms: -2.777777778 + 2.777777778 = 0.000000000
0.000000000 + -7.111111111x + x2 = 0 + 2.777777778
-7.111111111x + x2 = 0 + 2.777777778

Combine like terms: 0 + 2.777777778 = 2.777777778
-7.111111111x + x2 = 2.777777778

The x term is -7.111111111x.  Take half its coefficient (-3.555555556).
Square it (12.64197531) and add it to both sides.

Add '12.64197531' to each side of the equation.
-7.111111111x + 12.64197531 + x2 = 2.777777778 + 12.64197531

Reorder the terms:
12.64197531 + -7.111111111x + x2 = 2.777777778 + 12.64197531

Combine like terms: 2.777777778 + 12.64197531 = 15.419753088
12.64197531 + -7.111111111x + x2 = 15.419753088

Factor a perfect square on the left side:
(x + -3.555555556)(x + -3.555555556) = 15.419753088

Calculate the square root of the right side: 3.926799344

Break this problem into two subproblems by setting 
(x + -3.555555556) equal to 3.926799344 and -3.926799344.

Subproblem 1

x + -3.555555556 = 3.926799344 Simplifying x + -3.555555556 = 3.926799344 Reorder the terms: -3.555555556 + x = 3.926799344 Solving -3.555555556 + x = 3.926799344 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.555555556' to each side of the equation. -3.555555556 + 3.555555556 + x = 3.926799344 + 3.555555556 Combine like terms: -3.555555556 + 3.555555556 = 0.000000000 0.000000000 + x = 3.926799344 + 3.555555556 x = 3.926799344 + 3.555555556 Combine like terms: 3.926799344 + 3.555555556 = 7.4823549 x = 7.4823549 Simplifying x = 7.4823549

Subproblem 2

x + -3.555555556 = -3.926799344 Simplifying x + -3.555555556 = -3.926799344 Reorder the terms: -3.555555556 + x = -3.926799344 Solving -3.555555556 + x = -3.926799344 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.555555556' to each side of the equation. -3.555555556 + 3.555555556 + x = -3.926799344 + 3.555555556 Combine like terms: -3.555555556 + 3.555555556 = 0.000000000 0.000000000 + x = -3.926799344 + 3.555555556 x = -3.926799344 + 3.555555556 Combine like terms: -3.926799344 + 3.555555556 = -0.371243788 x = -0.371243788 Simplifying x = -0.371243788

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.4823549, -0.371243788}

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