5+.5x^2=25-3x

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Solution for 5+.5x^2=25-3x equation:


Simplifying
5 + 0.5x2 = 25 + -3x

Solving
5 + 0.5x2 = 25 + -3x

Solving for variable 'x'.

Reorder the terms:
5 + -25 + 3x + 0.5x2 = 25 + -3x + -25 + 3x

Combine like terms: 5 + -25 = -20
-20 + 3x + 0.5x2 = 25 + -3x + -25 + 3x

Reorder the terms:
-20 + 3x + 0.5x2 = 25 + -25 + -3x + 3x

Combine like terms: 25 + -25 = 0
-20 + 3x + 0.5x2 = 0 + -3x + 3x
-20 + 3x + 0.5x2 = -3x + 3x

Combine like terms: -3x + 3x = 0
-20 + 3x + 0.5x2 = 0

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

Divide each side by '0.5'.
-40 + 6x + x2 = 0

Move the constant term to the right:

Add '40' to each side of the equation.
-40 + 6x + 40 + x2 = 0 + 40

Reorder the terms:
-40 + 40 + 6x + x2 = 0 + 40

Combine like terms: -40 + 40 = 0
0 + 6x + x2 = 0 + 40
6x + x2 = 0 + 40

Combine like terms: 0 + 40 = 40
6x + x2 = 40

The x term is 6x.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6x + 9 + x2 = 40 + 9

Reorder the terms:
9 + 6x + x2 = 40 + 9

Combine like terms: 40 + 9 = 49
9 + 6x + x2 = 49

Factor a perfect square on the left side:
(x + 3)(x + 3) = 49

Calculate the square root of the right side: 7

Break this problem into two subproblems by setting 
(x + 3) equal to 7 and -7.

Subproblem 1

x + 3 = 7 Simplifying x + 3 = 7 Reorder the terms: 3 + x = 7 Solving 3 + x = 7 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 7 + -3 Combine like terms: 3 + -3 = 0 0 + x = 7 + -3 x = 7 + -3 Combine like terms: 7 + -3 = 4 x = 4 Simplifying x = 4

Subproblem 2

x + 3 = -7 Simplifying x + 3 = -7 Reorder the terms: 3 + x = -7 Solving 3 + x = -7 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = -7 + -3 Combine like terms: 3 + -3 = 0 0 + x = -7 + -3 x = -7 + -3 Combine like terms: -7 + -3 = -10 x = -10 Simplifying x = -10

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4, -10}

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