5x-3=.5(x^2+5x)

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Solution for 5x-3=.5(x^2+5x) equation:


Simplifying
5x + -3 = 0.5(x2 + 5x)

Reorder the terms:
-3 + 5x = 0.5(x2 + 5x)

Reorder the terms:
-3 + 5x = 0.5(5x + x2)
-3 + 5x = (5x * 0.5 + x2 * 0.5)
-3 + 5x = (2.5x + 0.5x2)

Solving
-3 + 5x = 2.5x + 0.5x2

Solving for variable 'x'.

Combine like terms: 5x + -2.5x = 2.5x
-3 + 2.5x + -0.5x2 = 2.5x + 0.5x2 + -2.5x + -0.5x2

Reorder the terms:
-3 + 2.5x + -0.5x2 = 2.5x + -2.5x + 0.5x2 + -0.5x2

Combine like terms: 2.5x + -2.5x = 0.0
-3 + 2.5x + -0.5x2 = 0.0 + 0.5x2 + -0.5x2
-3 + 2.5x + -0.5x2 = 0.5x2 + -0.5x2

Combine like terms: 0.5x2 + -0.5x2 = 0.0
-3 + 2.5x + -0.5x2 = 0.0

Begin completing the square.  Divide all terms by
-0.5 the coefficient of the squared term: 

Divide each side by '-0.5'.
6 + -5x + x2 = 0

Move the constant term to the right:

Add '-6' to each side of the equation.
6 + -5x + -6 + x2 = 0 + -6

Reorder the terms:
6 + -6 + -5x + x2 = 0 + -6

Combine like terms: 6 + -6 = 0
0 + -5x + x2 = 0 + -6
-5x + x2 = 0 + -6

Combine like terms: 0 + -6 = -6
-5x + x2 = -6

The x term is -5x.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5x + 6.25 + x2 = -6 + 6.25

Reorder the terms:
6.25 + -5x + x2 = -6 + 6.25

Combine like terms: -6 + 6.25 = 0.25
6.25 + -5x + x2 = 0.25

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 0.25

Calculate the square root of the right side: 0.5

Break this problem into two subproblems by setting 
(x + -2.5) equal to 0.5 and -0.5.

Subproblem 1

x + -2.5 = 0.5 Simplifying x + -2.5 = 0.5 Reorder the terms: -2.5 + x = 0.5 Solving -2.5 + x = 0.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = 0.5 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 0.5 + 2.5 x = 0.5 + 2.5 Combine like terms: 0.5 + 2.5 = 3 x = 3 Simplifying x = 3

Subproblem 2

x + -2.5 = -0.5 Simplifying x + -2.5 = -0.5 Reorder the terms: -2.5 + x = -0.5 Solving -2.5 + x = -0.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = -0.5 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -0.5 + 2.5 x = -0.5 + 2.5 Combine like terms: -0.5 + 2.5 = 2 x = 2 Simplifying x = 2

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3, 2}

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