5x^2=7x+17

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Solution for 5x^2=7x+17 equation:


Simplifying
5x2 = 7x + 17

Reorder the terms:
5x2 = 17 + 7x

Solving
5x2 = 17 + 7x

Solving for variable 'x'.

Reorder the terms:
-17 + -7x + 5x2 = 17 + 7x + -17 + -7x

Reorder the terms:
-17 + -7x + 5x2 = 17 + -17 + 7x + -7x

Combine like terms: 17 + -17 = 0
-17 + -7x + 5x2 = 0 + 7x + -7x
-17 + -7x + 5x2 = 7x + -7x

Combine like terms: 7x + -7x = 0
-17 + -7x + 5x2 = 0

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

Divide each side by '5'.
-3.4 + -1.4x + x2 = 0

Move the constant term to the right:

Add '3.4' to each side of the equation.
-3.4 + -1.4x + 3.4 + x2 = 0 + 3.4

Reorder the terms:
-3.4 + 3.4 + -1.4x + x2 = 0 + 3.4

Combine like terms: -3.4 + 3.4 = 0.0
0.0 + -1.4x + x2 = 0 + 3.4
-1.4x + x2 = 0 + 3.4

Combine like terms: 0 + 3.4 = 3.4
-1.4x + x2 = 3.4

The x term is -1.4x.  Take half its coefficient (-0.7).
Square it (0.49) and add it to both sides.

Add '0.49' to each side of the equation.
-1.4x + 0.49 + x2 = 3.4 + 0.49

Reorder the terms:
0.49 + -1.4x + x2 = 3.4 + 0.49

Combine like terms: 3.4 + 0.49 = 3.89
0.49 + -1.4x + x2 = 3.89

Factor a perfect square on the left side:
(x + -0.7)(x + -0.7) = 3.89

Calculate the square root of the right side: 1.972308292

Break this problem into two subproblems by setting 
(x + -0.7) equal to 1.972308292 and -1.972308292.

Subproblem 1

x + -0.7 = 1.972308292 Simplifying x + -0.7 = 1.972308292 Reorder the terms: -0.7 + x = 1.972308292 Solving -0.7 + x = 1.972308292 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + x = 1.972308292 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + x = 1.972308292 + 0.7 x = 1.972308292 + 0.7 Combine like terms: 1.972308292 + 0.7 = 2.672308292 x = 2.672308292 Simplifying x = 2.672308292

Subproblem 2

x + -0.7 = -1.972308292 Simplifying x + -0.7 = -1.972308292 Reorder the terms: -0.7 + x = -1.972308292 Solving -0.7 + x = -1.972308292 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + x = -1.972308292 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + x = -1.972308292 + 0.7 x = -1.972308292 + 0.7 Combine like terms: -1.972308292 + 0.7 = -1.272308292 x = -1.272308292 Simplifying x = -1.272308292

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.672308292, -1.272308292}

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