1515=x(10x-13)

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Solution for 1515=x(10x-13) equation:


Simplifying
1515 = x(10x + -13)

Reorder the terms:
1515 = x(-13 + 10x)
1515 = (-13 * x + 10x * x)
1515 = (-13x + 10x2)

Solving
1515 = -13x + 10x2

Solving for variable 'x'.

Reorder the terms:
1515 + 13x + -10x2 = -13x + 13x + 10x2 + -10x2

Combine like terms: -13x + 13x = 0
1515 + 13x + -10x2 = 0 + 10x2 + -10x2
1515 + 13x + -10x2 = 10x2 + -10x2

Combine like terms: 10x2 + -10x2 = 0
1515 + 13x + -10x2 = 0

Begin completing the square.  Divide all terms by
-10 the coefficient of the squared term: 

Divide each side by '-10'.
-151.5 + -1.3x + x2 = 0

Move the constant term to the right:

Add '151.5' to each side of the equation.
-151.5 + -1.3x + 151.5 + x2 = 0 + 151.5

Reorder the terms:
-151.5 + 151.5 + -1.3x + x2 = 0 + 151.5

Combine like terms: -151.5 + 151.5 = 0.0
0.0 + -1.3x + x2 = 0 + 151.5
-1.3x + x2 = 0 + 151.5

Combine like terms: 0 + 151.5 = 151.5
-1.3x + x2 = 151.5

The x term is -1.3x.  Take half its coefficient (-0.65).
Square it (0.4225) and add it to both sides.

Add '0.4225' to each side of the equation.
-1.3x + 0.4225 + x2 = 151.5 + 0.4225

Reorder the terms:
0.4225 + -1.3x + x2 = 151.5 + 0.4225

Combine like terms: 151.5 + 0.4225 = 151.9225
0.4225 + -1.3x + x2 = 151.9225

Factor a perfect square on the left side:
(x + -0.65)(x + -0.65) = 151.9225

Calculate the square root of the right side: 12.325684565

Break this problem into two subproblems by setting 
(x + -0.65) equal to 12.325684565 and -12.325684565.

Subproblem 1

x + -0.65 = 12.325684565 Simplifying x + -0.65 = 12.325684565 Reorder the terms: -0.65 + x = 12.325684565 Solving -0.65 + x = 12.325684565 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.65' to each side of the equation. -0.65 + 0.65 + x = 12.325684565 + 0.65 Combine like terms: -0.65 + 0.65 = 0.00 0.00 + x = 12.325684565 + 0.65 x = 12.325684565 + 0.65 Combine like terms: 12.325684565 + 0.65 = 12.975684565 x = 12.975684565 Simplifying x = 12.975684565

Subproblem 2

x + -0.65 = -12.325684565 Simplifying x + -0.65 = -12.325684565 Reorder the terms: -0.65 + x = -12.325684565 Solving -0.65 + x = -12.325684565 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.65' to each side of the equation. -0.65 + 0.65 + x = -12.325684565 + 0.65 Combine like terms: -0.65 + 0.65 = 0.00 0.00 + x = -12.325684565 + 0.65 x = -12.325684565 + 0.65 Combine like terms: -12.325684565 + 0.65 = -11.675684565 x = -11.675684565 Simplifying x = -11.675684565

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.975684565, -11.675684565}

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