16x(9x-20)=8x-25

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Solution for 16x(9x-20)=8x-25 equation:


Simplifying
16x(9x + -20) = 8x + -25

Reorder the terms:
16x(-20 + 9x) = 8x + -25
(-20 * 16x + 9x * 16x) = 8x + -25
(-320x + 144x2) = 8x + -25

Reorder the terms:
-320x + 144x2 = -25 + 8x

Solving
-320x + 144x2 = -25 + 8x

Solving for variable 'x'.

Reorder the terms:
25 + -320x + -8x + 144x2 = -25 + 8x + 25 + -8x

Combine like terms: -320x + -8x = -328x
25 + -328x + 144x2 = -25 + 8x + 25 + -8x

Reorder the terms:
25 + -328x + 144x2 = -25 + 25 + 8x + -8x

Combine like terms: -25 + 25 = 0
25 + -328x + 144x2 = 0 + 8x + -8x
25 + -328x + 144x2 = 8x + -8x

Combine like terms: 8x + -8x = 0
25 + -328x + 144x2 = 0

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

Divide each side by '144'.
0.1736111111 + -2.277777778x + x2 = 0

Move the constant term to the right:

Add '-0.1736111111' to each side of the equation.
0.1736111111 + -2.277777778x + -0.1736111111 + x2 = 0 + -0.1736111111

Reorder the terms:
0.1736111111 + -0.1736111111 + -2.277777778x + x2 = 0 + -0.1736111111

Combine like terms: 0.1736111111 + -0.1736111111 = 0.0000000000
0.0000000000 + -2.277777778x + x2 = 0 + -0.1736111111
-2.277777778x + x2 = 0 + -0.1736111111

Combine like terms: 0 + -0.1736111111 = -0.1736111111
-2.277777778x + x2 = -0.1736111111

The x term is -2.277777778x.  Take half its coefficient (-1.138888889).
Square it (1.297067901) and add it to both sides.

Add '1.297067901' to each side of the equation.
-2.277777778x + 1.297067901 + x2 = -0.1736111111 + 1.297067901

Reorder the terms:
1.297067901 + -2.277777778x + x2 = -0.1736111111 + 1.297067901

Combine like terms: -0.1736111111 + 1.297067901 = 1.1234567899
1.297067901 + -2.277777778x + x2 = 1.1234567899

Factor a perfect square on the left side:
(x + -1.138888889)(x + -1.138888889) = 1.1234567899

Calculate the square root of the right side: 1.059932446

Break this problem into two subproblems by setting 
(x + -1.138888889) equal to 1.059932446 and -1.059932446.

Subproblem 1

x + -1.138888889 = 1.059932446 Simplifying x + -1.138888889 = 1.059932446 Reorder the terms: -1.138888889 + x = 1.059932446 Solving -1.138888889 + x = 1.059932446 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.138888889' to each side of the equation. -1.138888889 + 1.138888889 + x = 1.059932446 + 1.138888889 Combine like terms: -1.138888889 + 1.138888889 = 0.000000000 0.000000000 + x = 1.059932446 + 1.138888889 x = 1.059932446 + 1.138888889 Combine like terms: 1.059932446 + 1.138888889 = 2.198821335 x = 2.198821335 Simplifying x = 2.198821335

Subproblem 2

x + -1.138888889 = -1.059932446 Simplifying x + -1.138888889 = -1.059932446 Reorder the terms: -1.138888889 + x = -1.059932446 Solving -1.138888889 + x = -1.059932446 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.138888889' to each side of the equation. -1.138888889 + 1.138888889 + x = -1.059932446 + 1.138888889 Combine like terms: -1.138888889 + 1.138888889 = 0.000000000 0.000000000 + x = -1.059932446 + 1.138888889 x = -1.059932446 + 1.138888889 Combine like terms: -1.059932446 + 1.138888889 = 0.078956443 x = 0.078956443 Simplifying x = 0.078956443

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.198821335, 0.078956443}

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