1440=x(x-19)

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Solution for 1440=x(x-19) equation:


Simplifying
1440 = x(x + -19)

Reorder the terms:
1440 = x(-19 + x)
1440 = (-19 * x + x * x)
1440 = (-19x + x2)

Solving
1440 = -19x + x2

Solving for variable 'x'.

Reorder the terms:
1440 + 19x + -1x2 = -19x + 19x + x2 + -1x2

Combine like terms: -19x + 19x = 0
1440 + 19x + -1x2 = 0 + x2 + -1x2
1440 + 19x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
1440 + 19x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-1440 + -19x + x2 = 0

Move the constant term to the right:

Add '1440' to each side of the equation.
-1440 + -19x + 1440 + x2 = 0 + 1440

Reorder the terms:
-1440 + 1440 + -19x + x2 = 0 + 1440

Combine like terms: -1440 + 1440 = 0
0 + -19x + x2 = 0 + 1440
-19x + x2 = 0 + 1440

Combine like terms: 0 + 1440 = 1440
-19x + x2 = 1440

The x term is -19x.  Take half its coefficient (-9.5).
Square it (90.25) and add it to both sides.

Add '90.25' to each side of the equation.
-19x + 90.25 + x2 = 1440 + 90.25

Reorder the terms:
90.25 + -19x + x2 = 1440 + 90.25

Combine like terms: 1440 + 90.25 = 1530.25
90.25 + -19x + x2 = 1530.25

Factor a perfect square on the left side:
(x + -9.5)(x + -9.5) = 1530.25

Calculate the square root of the right side: 39.118409988

Break this problem into two subproblems by setting 
(x + -9.5) equal to 39.118409988 and -39.118409988.

Subproblem 1

x + -9.5 = 39.118409988 Simplifying x + -9.5 = 39.118409988 Reorder the terms: -9.5 + x = 39.118409988 Solving -9.5 + x = 39.118409988 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9.5' to each side of the equation. -9.5 + 9.5 + x = 39.118409988 + 9.5 Combine like terms: -9.5 + 9.5 = 0.0 0.0 + x = 39.118409988 + 9.5 x = 39.118409988 + 9.5 Combine like terms: 39.118409988 + 9.5 = 48.618409988 x = 48.618409988 Simplifying x = 48.618409988

Subproblem 2

x + -9.5 = -39.118409988 Simplifying x + -9.5 = -39.118409988 Reorder the terms: -9.5 + x = -39.118409988 Solving -9.5 + x = -39.118409988 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9.5' to each side of the equation. -9.5 + 9.5 + x = -39.118409988 + 9.5 Combine like terms: -9.5 + 9.5 = 0.0 0.0 + x = -39.118409988 + 9.5 x = -39.118409988 + 9.5 Combine like terms: -39.118409988 + 9.5 = -29.618409988 x = -29.618409988 Simplifying x = -29.618409988

Solution

The solution to the problem is based on the solutions from the subproblems. x = {48.618409988, -29.618409988}

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