3x(5x-9)+8(3x-2)=

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Solution for 3x(5x-9)+8(3x-2)= equation:


Simplifying
3x(5x + -9) + 8(3x + -2) = 0

Reorder the terms:
3x(-9 + 5x) + 8(3x + -2) = 0
(-9 * 3x + 5x * 3x) + 8(3x + -2) = 0
(-27x + 15x2) + 8(3x + -2) = 0

Reorder the terms:
-27x + 15x2 + 8(-2 + 3x) = 0
-27x + 15x2 + (-2 * 8 + 3x * 8) = 0
-27x + 15x2 + (-16 + 24x) = 0

Reorder the terms:
-16 + -27x + 24x + 15x2 = 0

Combine like terms: -27x + 24x = -3x
-16 + -3x + 15x2 = 0

Solving
-16 + -3x + 15x2 = 0

Solving for variable 'x'.

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

Divide each side by '15'.
-1.066666667 + -0.2x + x2 = 0

Move the constant term to the right:

Add '1.066666667' to each side of the equation.
-1.066666667 + -0.2x + 1.066666667 + x2 = 0 + 1.066666667

Reorder the terms:
-1.066666667 + 1.066666667 + -0.2x + x2 = 0 + 1.066666667

Combine like terms: -1.066666667 + 1.066666667 = 0.000000000
0.000000000 + -0.2x + x2 = 0 + 1.066666667
-0.2x + x2 = 0 + 1.066666667

Combine like terms: 0 + 1.066666667 = 1.066666667
-0.2x + x2 = 1.066666667

The x term is -0.2x.  Take half its coefficient (-0.1).
Square it (0.01) and add it to both sides.

Add '0.01' to each side of the equation.
-0.2x + 0.01 + x2 = 1.066666667 + 0.01

Reorder the terms:
0.01 + -0.2x + x2 = 1.066666667 + 0.01

Combine like terms: 1.066666667 + 0.01 = 1.076666667
0.01 + -0.2x + x2 = 1.076666667

Factor a perfect square on the left side:
(x + -0.1)(x + -0.1) = 1.076666667

Calculate the square root of the right side: 1.037625495

Break this problem into two subproblems by setting 
(x + -0.1) equal to 1.037625495 and -1.037625495.

Subproblem 1

x + -0.1 = 1.037625495 Simplifying x + -0.1 = 1.037625495 Reorder the terms: -0.1 + x = 1.037625495 Solving -0.1 + x = 1.037625495 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1' to each side of the equation. -0.1 + 0.1 + x = 1.037625495 + 0.1 Combine like terms: -0.1 + 0.1 = 0.0 0.0 + x = 1.037625495 + 0.1 x = 1.037625495 + 0.1 Combine like terms: 1.037625495 + 0.1 = 1.137625495 x = 1.137625495 Simplifying x = 1.137625495

Subproblem 2

x + -0.1 = -1.037625495 Simplifying x + -0.1 = -1.037625495 Reorder the terms: -0.1 + x = -1.037625495 Solving -0.1 + x = -1.037625495 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1' to each side of the equation. -0.1 + 0.1 + x = -1.037625495 + 0.1 Combine like terms: -0.1 + 0.1 = 0.0 0.0 + x = -1.037625495 + 0.1 x = -1.037625495 + 0.1 Combine like terms: -1.037625495 + 0.1 = -0.937625495 x = -0.937625495 Simplifying x = -0.937625495

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.137625495, -0.937625495}

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