7x+13-5x^2+8x=

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Solution for 7x+13-5x^2+8x= equation:


Simplifying
7x + 13 + -5x2 + 8x = 0

Reorder the terms:
13 + 7x + 8x + -5x2 = 0

Combine like terms: 7x + 8x = 15x
13 + 15x + -5x2 = 0

Solving
13 + 15x + -5x2 = 0

Solving for variable 'x'.

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

Divide each side by '-5'.
-2.6 + -3x + x2 = 0

Move the constant term to the right:

Add '2.6' to each side of the equation.
-2.6 + -3x + 2.6 + x2 = 0 + 2.6

Reorder the terms:
-2.6 + 2.6 + -3x + x2 = 0 + 2.6

Combine like terms: -2.6 + 2.6 = 0.0
0.0 + -3x + x2 = 0 + 2.6
-3x + x2 = 0 + 2.6

Combine like terms: 0 + 2.6 = 2.6
-3x + x2 = 2.6

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = 2.6 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 2.6 + 2.25

Combine like terms: 2.6 + 2.25 = 4.85
2.25 + -3x + x2 = 4.85

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 4.85

Calculate the square root of the right side: 2.202271555

Break this problem into two subproblems by setting 
(x + -1.5) equal to 2.202271555 and -2.202271555.

Subproblem 1

x + -1.5 = 2.202271555 Simplifying x + -1.5 = 2.202271555 Reorder the terms: -1.5 + x = 2.202271555 Solving -1.5 + x = 2.202271555 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 2.202271555 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 2.202271555 + 1.5 x = 2.202271555 + 1.5 Combine like terms: 2.202271555 + 1.5 = 3.702271555 x = 3.702271555 Simplifying x = 3.702271555

Subproblem 2

x + -1.5 = -2.202271555 Simplifying x + -1.5 = -2.202271555 Reorder the terms: -1.5 + x = -2.202271555 Solving -1.5 + x = -2.202271555 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -2.202271555 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -2.202271555 + 1.5 x = -2.202271555 + 1.5 Combine like terms: -2.202271555 + 1.5 = -0.702271555 x = -0.702271555 Simplifying x = -0.702271555

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.702271555, -0.702271555}

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