x^2-9.0x=15.75

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Solution for x^2-9.0x=15.75 equation:


Simplifying
x2 + -9.0x = 15.75

Reorder the terms:
-9.0x + x2 = 15.75

Solving
-9.0x + x2 = 15.75

Solving for variable 'x'.

Reorder the terms:
-15.75 + -9.0x + x2 = 15.75 + -15.75

Combine like terms: 15.75 + -15.75 = 0.00
-15.75 + -9.0x + x2 = 0.00

Begin completing the square.

Move the constant term to the right:

Add '15.75' to each side of the equation.
-15.75 + -9.0x + 15.75 + x2 = 0.00 + 15.75

Reorder the terms:
-15.75 + 15.75 + -9.0x + x2 = 0.00 + 15.75

Combine like terms: -15.75 + 15.75 = 0.00
0.00 + -9.0x + x2 = 0.00 + 15.75
-9.0x + x2 = 0.00 + 15.75

Combine like terms: 0.00 + 15.75 = 15.75
-9.0x + x2 = 15.75

The x term is -9.0x.  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.
-9.0x + 20.25 + x2 = 15.75 + 20.25

Reorder the terms:
20.25 + -9.0x + x2 = 15.75 + 20.25

Combine like terms: 15.75 + 20.25 = 36
20.25 + -9.0x + x2 = 36

Factor a perfect square on the left side:
(x + -4.5)(x + -4.5) = 36

Calculate the square root of the right side: 6

Break this problem into two subproblems by setting 
(x + -4.5) equal to 6 and -6.

Subproblem 1

x + -4.5 = 6 Simplifying x + -4.5 = 6 Reorder the terms: -4.5 + x = 6 Solving -4.5 + x = 6 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 = 6 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = 6 + 4.5 x = 6 + 4.5 Combine like terms: 6 + 4.5 = 10.5 x = 10.5 Simplifying x = 10.5

Subproblem 2

x + -4.5 = -6 Simplifying x + -4.5 = -6 Reorder the terms: -4.5 + x = -6 Solving -4.5 + x = -6 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 = -6 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = -6 + 4.5 x = -6 + 4.5 Combine like terms: -6 + 4.5 = -1.5 x = -1.5 Simplifying x = -1.5

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.5, -1.5}

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