1.7x(x+5)=2.1x+9.7

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Solution for 1.7x(x+5)=2.1x+9.7 equation:


Simplifying
1.7x(x + 5) = 2.1x + 9.7

Reorder the terms:
1.7x(5 + x) = 2.1x + 9.7
(5 * 1.7x + x * 1.7x) = 2.1x + 9.7
(8.5x + 1.7x2) = 2.1x + 9.7

Reorder the terms:
8.5x + 1.7x2 = 9.7 + 2.1x

Solving
8.5x + 1.7x2 = 9.7 + 2.1x

Solving for variable 'x'.

Reorder the terms:
-9.7 + 8.5x + -2.1x + 1.7x2 = 9.7 + 2.1x + -9.7 + -2.1x

Combine like terms: 8.5x + -2.1x = 6.4x
-9.7 + 6.4x + 1.7x2 = 9.7 + 2.1x + -9.7 + -2.1x

Reorder the terms:
-9.7 + 6.4x + 1.7x2 = 9.7 + -9.7 + 2.1x + -2.1x

Combine like terms: 9.7 + -9.7 = 0.0
-9.7 + 6.4x + 1.7x2 = 0.0 + 2.1x + -2.1x
-9.7 + 6.4x + 1.7x2 = 2.1x + -2.1x

Combine like terms: 2.1x + -2.1x = 0.0
-9.7 + 6.4x + 1.7x2 = 0.0

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

Divide each side by '1.7'.
-5.705882353 + 3.764705882x + x2 = 0

Move the constant term to the right:

Add '5.705882353' to each side of the equation.
-5.705882353 + 3.764705882x + 5.705882353 + x2 = 0 + 5.705882353

Reorder the terms:
-5.705882353 + 5.705882353 + 3.764705882x + x2 = 0 + 5.705882353

Combine like terms: -5.705882353 + 5.705882353 = 0.000000000
0.000000000 + 3.764705882x + x2 = 0 + 5.705882353
3.764705882x + x2 = 0 + 5.705882353

Combine like terms: 0 + 5.705882353 = 5.705882353
3.764705882x + x2 = 5.705882353

The x term is 3.764705882x.  Take half its coefficient (1.882352941).
Square it (3.543252594) and add it to both sides.

Add '3.543252594' to each side of the equation.
3.764705882x + 3.543252594 + x2 = 5.705882353 + 3.543252594

Reorder the terms:
3.543252594 + 3.764705882x + x2 = 5.705882353 + 3.543252594

Combine like terms: 5.705882353 + 3.543252594 = 9.249134947
3.543252594 + 3.764705882x + x2 = 9.249134947

Factor a perfect square on the left side:
(x + 1.882352941)(x + 1.882352941) = 9.249134947

Calculate the square root of the right side: 3.041239048

Break this problem into two subproblems by setting 
(x + 1.882352941) equal to 3.041239048 and -3.041239048.

Subproblem 1

x + 1.882352941 = 3.041239048 Simplifying x + 1.882352941 = 3.041239048 Reorder the terms: 1.882352941 + x = 3.041239048 Solving 1.882352941 + x = 3.041239048 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.882352941' to each side of the equation. 1.882352941 + -1.882352941 + x = 3.041239048 + -1.882352941 Combine like terms: 1.882352941 + -1.882352941 = 0.000000000 0.000000000 + x = 3.041239048 + -1.882352941 x = 3.041239048 + -1.882352941 Combine like terms: 3.041239048 + -1.882352941 = 1.158886107 x = 1.158886107 Simplifying x = 1.158886107

Subproblem 2

x + 1.882352941 = -3.041239048 Simplifying x + 1.882352941 = -3.041239048 Reorder the terms: 1.882352941 + x = -3.041239048 Solving 1.882352941 + x = -3.041239048 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.882352941' to each side of the equation. 1.882352941 + -1.882352941 + x = -3.041239048 + -1.882352941 Combine like terms: 1.882352941 + -1.882352941 = 0.000000000 0.000000000 + x = -3.041239048 + -1.882352941 x = -3.041239048 + -1.882352941 Combine like terms: -3.041239048 + -1.882352941 = -4.923591989 x = -4.923591989 Simplifying x = -4.923591989

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.158886107, -4.923591989}

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