2x^2-17x+31=x^2+3x+8

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Solution for 2x^2-17x+31=x^2+3x+8 equation:


Simplifying
2x2 + -17x + 31 = x2 + 3x + 8

Reorder the terms:
31 + -17x + 2x2 = x2 + 3x + 8

Reorder the terms:
31 + -17x + 2x2 = 8 + 3x + x2

Solving
31 + -17x + 2x2 = 8 + 3x + x2

Solving for variable 'x'.

Reorder the terms:
31 + -8 + -17x + -3x + 2x2 + -1x2 = 8 + 3x + x2 + -8 + -3x + -1x2

Combine like terms: 31 + -8 = 23
23 + -17x + -3x + 2x2 + -1x2 = 8 + 3x + x2 + -8 + -3x + -1x2

Combine like terms: -17x + -3x = -20x
23 + -20x + 2x2 + -1x2 = 8 + 3x + x2 + -8 + -3x + -1x2

Combine like terms: 2x2 + -1x2 = 1x2
23 + -20x + 1x2 = 8 + 3x + x2 + -8 + -3x + -1x2

Reorder the terms:
23 + -20x + 1x2 = 8 + -8 + 3x + -3x + x2 + -1x2

Combine like terms: 8 + -8 = 0
23 + -20x + 1x2 = 0 + 3x + -3x + x2 + -1x2
23 + -20x + 1x2 = 3x + -3x + x2 + -1x2

Combine like terms: 3x + -3x = 0
23 + -20x + 1x2 = 0 + x2 + -1x2
23 + -20x + 1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
23 + -20x + 1x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-23' to each side of the equation.
23 + -20x + -23 + x2 = 0 + -23

Reorder the terms:
23 + -23 + -20x + x2 = 0 + -23

Combine like terms: 23 + -23 = 0
0 + -20x + x2 = 0 + -23
-20x + x2 = 0 + -23

Combine like terms: 0 + -23 = -23
-20x + x2 = -23

The x term is -20x.  Take half its coefficient (-10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
-20x + 100 + x2 = -23 + 100

Reorder the terms:
100 + -20x + x2 = -23 + 100

Combine like terms: -23 + 100 = 77
100 + -20x + x2 = 77

Factor a perfect square on the left side:
(x + -10)(x + -10) = 77

Calculate the square root of the right side: 8.774964387

Break this problem into two subproblems by setting 
(x + -10) equal to 8.774964387 and -8.774964387.

Subproblem 1

x + -10 = 8.774964387 Simplifying x + -10 = 8.774964387 Reorder the terms: -10 + x = 8.774964387 Solving -10 + x = 8.774964387 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + x = 8.774964387 + 10 Combine like terms: -10 + 10 = 0 0 + x = 8.774964387 + 10 x = 8.774964387 + 10 Combine like terms: 8.774964387 + 10 = 18.774964387 x = 18.774964387 Simplifying x = 18.774964387

Subproblem 2

x + -10 = -8.774964387 Simplifying x + -10 = -8.774964387 Reorder the terms: -10 + x = -8.774964387 Solving -10 + x = -8.774964387 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + x = -8.774964387 + 10 Combine like terms: -10 + 10 = 0 0 + x = -8.774964387 + 10 x = -8.774964387 + 10 Combine like terms: -8.774964387 + 10 = 1.225035613 x = 1.225035613 Simplifying x = 1.225035613

Solution

The solution to the problem is based on the solutions from the subproblems. x = {18.774964387, 1.225035613}

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