25x^2-24x-9=7x+12x-18

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Solution for 25x^2-24x-9=7x+12x-18 equation:


Simplifying
25x2 + -24x + -9 = 7x + 12x + -18

Reorder the terms:
-9 + -24x + 25x2 = 7x + 12x + -18

Reorder the terms:
-9 + -24x + 25x2 = -18 + 7x + 12x

Combine like terms: 7x + 12x = 19x
-9 + -24x + 25x2 = -18 + 19x

Solving
-9 + -24x + 25x2 = -18 + 19x

Solving for variable 'x'.

Reorder the terms:
-9 + 18 + -24x + -19x + 25x2 = -18 + 19x + 18 + -19x

Combine like terms: -9 + 18 = 9
9 + -24x + -19x + 25x2 = -18 + 19x + 18 + -19x

Combine like terms: -24x + -19x = -43x
9 + -43x + 25x2 = -18 + 19x + 18 + -19x

Reorder the terms:
9 + -43x + 25x2 = -18 + 18 + 19x + -19x

Combine like terms: -18 + 18 = 0
9 + -43x + 25x2 = 0 + 19x + -19x
9 + -43x + 25x2 = 19x + -19x

Combine like terms: 19x + -19x = 0
9 + -43x + 25x2 = 0

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

Divide each side by '25'.
0.36 + -1.72x + x2 = 0

Move the constant term to the right:

Add '-0.36' to each side of the equation.
0.36 + -1.72x + -0.36 + x2 = 0 + -0.36

Reorder the terms:
0.36 + -0.36 + -1.72x + x2 = 0 + -0.36

Combine like terms: 0.36 + -0.36 = 0.00
0.00 + -1.72x + x2 = 0 + -0.36
-1.72x + x2 = 0 + -0.36

Combine like terms: 0 + -0.36 = -0.36
-1.72x + x2 = -0.36

The x term is -1.72x.  Take half its coefficient (-0.86).
Square it (0.7396) and add it to both sides.

Add '0.7396' to each side of the equation.
-1.72x + 0.7396 + x2 = -0.36 + 0.7396

Reorder the terms:
0.7396 + -1.72x + x2 = -0.36 + 0.7396

Combine like terms: -0.36 + 0.7396 = 0.3796
0.7396 + -1.72x + x2 = 0.3796

Factor a perfect square on the left side:
(x + -0.86)(x + -0.86) = 0.3796

Calculate the square root of the right side: 0.616116872

Break this problem into two subproblems by setting 
(x + -0.86) equal to 0.616116872 and -0.616116872.

Subproblem 1

x + -0.86 = 0.616116872 Simplifying x + -0.86 = 0.616116872 Reorder the terms: -0.86 + x = 0.616116872 Solving -0.86 + x = 0.616116872 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.86' to each side of the equation. -0.86 + 0.86 + x = 0.616116872 + 0.86 Combine like terms: -0.86 + 0.86 = 0.00 0.00 + x = 0.616116872 + 0.86 x = 0.616116872 + 0.86 Combine like terms: 0.616116872 + 0.86 = 1.476116872 x = 1.476116872 Simplifying x = 1.476116872

Subproblem 2

x + -0.86 = -0.616116872 Simplifying x + -0.86 = -0.616116872 Reorder the terms: -0.86 + x = -0.616116872 Solving -0.86 + x = -0.616116872 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.86' to each side of the equation. -0.86 + 0.86 + x = -0.616116872 + 0.86 Combine like terms: -0.86 + 0.86 = 0.00 0.00 + x = -0.616116872 + 0.86 x = -0.616116872 + 0.86 Combine like terms: -0.616116872 + 0.86 = 0.243883128 x = 0.243883128 Simplifying x = 0.243883128

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.476116872, 0.243883128}

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