x^2+9x=43.75

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Solution for x^2+9x=43.75 equation:


Simplifying
x2 + 9x = 43.75

Reorder the terms:
9x + x2 = 43.75

Solving
9x + x2 = 43.75

Solving for variable 'x'.

Reorder the terms:
-43.75 + 9x + x2 = 43.75 + -43.75

Combine like terms: 43.75 + -43.75 = 0.00
-43.75 + 9x + x2 = 0.00

Begin completing the square.

Move the constant term to the right:

Add '43.75' to each side of the equation.
-43.75 + 9x + 43.75 + x2 = 0.00 + 43.75

Reorder the terms:
-43.75 + 43.75 + 9x + x2 = 0.00 + 43.75

Combine like terms: -43.75 + 43.75 = 0.00
0.00 + 9x + x2 = 0.00 + 43.75
9x + x2 = 0.00 + 43.75

Combine like terms: 0.00 + 43.75 = 43.75
9x + x2 = 43.75

The x term is 9x.  Take half its coefficient (4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
9x + 20.25 + x2 = 43.75 + 20.25

Reorder the terms:
20.25 + 9x + x2 = 43.75 + 20.25

Combine like terms: 43.75 + 20.25 = 64
20.25 + 9x + x2 = 64

Factor a perfect square on the left side:
(x + 4.5)(x + 4.5) = 64

Calculate the square root of the right side: 8

Break this problem into two subproblems by setting 
(x + 4.5) equal to 8 and -8.

Subproblem 1

x + 4.5 = 8 Simplifying x + 4.5 = 8 Reorder the terms: 4.5 + x = 8 Solving 4.5 + x = 8 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = 8 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = 8 + -4.5 x = 8 + -4.5 Combine like terms: 8 + -4.5 = 3.5 x = 3.5 Simplifying x = 3.5

Subproblem 2

x + 4.5 = -8 Simplifying x + 4.5 = -8 Reorder the terms: 4.5 + x = -8 Solving 4.5 + x = -8 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = -8 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = -8 + -4.5 x = -8 + -4.5 Combine like terms: -8 + -4.5 = -12.5 x = -12.5 Simplifying x = -12.5

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.5, -12.5}

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