(21x-2)(38x+5)=360

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Solution for (21x-2)(38x+5)=360 equation:


Simplifying
(21x + -2)(38x + 5) = 360

Reorder the terms:
(-2 + 21x)(38x + 5) = 360

Reorder the terms:
(-2 + 21x)(5 + 38x) = 360

Multiply (-2 + 21x) * (5 + 38x)
(-2(5 + 38x) + 21x * (5 + 38x)) = 360
((5 * -2 + 38x * -2) + 21x * (5 + 38x)) = 360
((-10 + -76x) + 21x * (5 + 38x)) = 360
(-10 + -76x + (5 * 21x + 38x * 21x)) = 360
(-10 + -76x + (105x + 798x2)) = 360

Combine like terms: -76x + 105x = 29x
(-10 + 29x + 798x2) = 360

Solving
-10 + 29x + 798x2 = 360

Solving for variable 'x'.

Reorder the terms:
-10 + -360 + 29x + 798x2 = 360 + -360

Combine like terms: -10 + -360 = -370
-370 + 29x + 798x2 = 360 + -360

Combine like terms: 360 + -360 = 0
-370 + 29x + 798x2 = 0

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

Divide each side by '798'.
-0.4636591479 + 0.03634085213x + x2 = 0

Move the constant term to the right:

Add '0.4636591479' to each side of the equation.
-0.4636591479 + 0.03634085213x + 0.4636591479 + x2 = 0 + 0.4636591479

Reorder the terms:
-0.4636591479 + 0.4636591479 + 0.03634085213x + x2 = 0 + 0.4636591479

Combine like terms: -0.4636591479 + 0.4636591479 = 0.0000000000
0.0000000000 + 0.03634085213x + x2 = 0 + 0.4636591479
0.03634085213x + x2 = 0 + 0.4636591479

Combine like terms: 0 + 0.4636591479 = 0.4636591479
0.03634085213x + x2 = 0.4636591479

The x term is 0.03634085213x.  Take half its coefficient (0.01817042607).
Square it (0.0003301643836) and add it to both sides.

Add '0.0003301643836' to each side of the equation.
0.03634085213x + 0.0003301643836 + x2 = 0.4636591479 + 0.0003301643836

Reorder the terms:
0.0003301643836 + 0.03634085213x + x2 = 0.4636591479 + 0.0003301643836

Combine like terms: 0.4636591479 + 0.0003301643836 = 0.4639893122836
0.0003301643836 + 0.03634085213x + x2 = 0.4639893122836

Factor a perfect square on the left side:
(x + 0.01817042607)(x + 0.01817042607) = 0.4639893122836

Calculate the square root of the right side: 0.68116761

Break this problem into two subproblems by setting 
(x + 0.01817042607) equal to 0.68116761 and -0.68116761.

Subproblem 1

x + 0.01817042607 = 0.68116761 Simplifying x + 0.01817042607 = 0.68116761 Reorder the terms: 0.01817042607 + x = 0.68116761 Solving 0.01817042607 + x = 0.68116761 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.01817042607' to each side of the equation. 0.01817042607 + -0.01817042607 + x = 0.68116761 + -0.01817042607 Combine like terms: 0.01817042607 + -0.01817042607 = 0.00000000000 0.00000000000 + x = 0.68116761 + -0.01817042607 x = 0.68116761 + -0.01817042607 Combine like terms: 0.68116761 + -0.01817042607 = 0.66299718393 x = 0.66299718393 Simplifying x = 0.66299718393

Subproblem 2

x + 0.01817042607 = -0.68116761 Simplifying x + 0.01817042607 = -0.68116761 Reorder the terms: 0.01817042607 + x = -0.68116761 Solving 0.01817042607 + x = -0.68116761 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.01817042607' to each side of the equation. 0.01817042607 + -0.01817042607 + x = -0.68116761 + -0.01817042607 Combine like terms: 0.01817042607 + -0.01817042607 = 0.00000000000 0.00000000000 + x = -0.68116761 + -0.01817042607 x = -0.68116761 + -0.01817042607 Combine like terms: -0.68116761 + -0.01817042607 = -0.69933803607 x = -0.69933803607 Simplifying x = -0.69933803607

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.66299718393, -0.69933803607}

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