2x^2+17x=15

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Solution for 2x^2+17x=15 equation:


Simplifying
2x2 + 17x = 15

Reorder the terms:
17x + 2x2 = 15

Solving
17x + 2x2 = 15

Solving for variable 'x'.

Reorder the terms:
-15 + 17x + 2x2 = 15 + -15

Combine like terms: 15 + -15 = 0
-15 + 17x + 2x2 = 0

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

Divide each side by '2'.
-7.5 + 8.5x + x2 = 0

Move the constant term to the right:

Add '7.5' to each side of the equation.
-7.5 + 8.5x + 7.5 + x2 = 0 + 7.5

Reorder the terms:
-7.5 + 7.5 + 8.5x + x2 = 0 + 7.5

Combine like terms: -7.5 + 7.5 = 0.0
0.0 + 8.5x + x2 = 0 + 7.5
8.5x + x2 = 0 + 7.5

Combine like terms: 0 + 7.5 = 7.5
8.5x + x2 = 7.5

The x term is 8.5x.  Take half its coefficient (4.25).
Square it (18.0625) and add it to both sides.

Add '18.0625' to each side of the equation.
8.5x + 18.0625 + x2 = 7.5 + 18.0625

Reorder the terms:
18.0625 + 8.5x + x2 = 7.5 + 18.0625

Combine like terms: 7.5 + 18.0625 = 25.5625
18.0625 + 8.5x + x2 = 25.5625

Factor a perfect square on the left side:
(x + 4.25)(x + 4.25) = 25.5625

Calculate the square root of the right side: 5.055937104

Break this problem into two subproblems by setting 
(x + 4.25) equal to 5.055937104 and -5.055937104.

Subproblem 1

x + 4.25 = 5.055937104 Simplifying x + 4.25 = 5.055937104 Reorder the terms: 4.25 + x = 5.055937104 Solving 4.25 + x = 5.055937104 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.25' to each side of the equation. 4.25 + -4.25 + x = 5.055937104 + -4.25 Combine like terms: 4.25 + -4.25 = 0.00 0.00 + x = 5.055937104 + -4.25 x = 5.055937104 + -4.25 Combine like terms: 5.055937104 + -4.25 = 0.805937104 x = 0.805937104 Simplifying x = 0.805937104

Subproblem 2

x + 4.25 = -5.055937104 Simplifying x + 4.25 = -5.055937104 Reorder the terms: 4.25 + x = -5.055937104 Solving 4.25 + x = -5.055937104 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.25' to each side of the equation. 4.25 + -4.25 + x = -5.055937104 + -4.25 Combine like terms: 4.25 + -4.25 = 0.00 0.00 + x = -5.055937104 + -4.25 x = -5.055937104 + -4.25 Combine like terms: -5.055937104 + -4.25 = -9.305937104 x = -9.305937104 Simplifying x = -9.305937104

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.805937104, -9.305937104}

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