(x-3)(x+3)+15=10x

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Solution for (x-3)(x+3)+15=10x equation:


Simplifying
(x + -3)(x + 3) + 15 = 10x

Reorder the terms:
(-3 + x)(x + 3) + 15 = 10x

Reorder the terms:
(-3 + x)(3 + x) + 15 = 10x

Multiply (-3 + x) * (3 + x)
(-3(3 + x) + x(3 + x)) + 15 = 10x
((3 * -3 + x * -3) + x(3 + x)) + 15 = 10x
((-9 + -3x) + x(3 + x)) + 15 = 10x
(-9 + -3x + (3 * x + x * x)) + 15 = 10x
(-9 + -3x + (3x + x2)) + 15 = 10x

Combine like terms: -3x + 3x = 0
(-9 + 0 + x2) + 15 = 10x
(-9 + x2) + 15 = 10x

Reorder the terms:
-9 + 15 + x2 = 10x

Combine like terms: -9 + 15 = 6
6 + x2 = 10x

Solving
6 + x2 = 10x

Solving for variable 'x'.

Reorder the terms:
6 + -10x + x2 = 10x + -10x

Combine like terms: 10x + -10x = 0
6 + -10x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-6' to each side of the equation.
6 + -10x + -6 + x2 = 0 + -6

Reorder the terms:
6 + -6 + -10x + x2 = 0 + -6

Combine like terms: 6 + -6 = 0
0 + -10x + x2 = 0 + -6
-10x + x2 = 0 + -6

Combine like terms: 0 + -6 = -6
-10x + x2 = -6

The x term is -10x.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10x + 25 + x2 = -6 + 25

Reorder the terms:
25 + -10x + x2 = -6 + 25

Combine like terms: -6 + 25 = 19
25 + -10x + x2 = 19

Factor a perfect square on the left side:
(x + -5)(x + -5) = 19

Calculate the square root of the right side: 4.358898944

Break this problem into two subproblems by setting 
(x + -5) equal to 4.358898944 and -4.358898944.

Subproblem 1

x + -5 = 4.358898944 Simplifying x + -5 = 4.358898944 Reorder the terms: -5 + x = 4.358898944 Solving -5 + x = 4.358898944 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = 4.358898944 + 5 Combine like terms: -5 + 5 = 0 0 + x = 4.358898944 + 5 x = 4.358898944 + 5 Combine like terms: 4.358898944 + 5 = 9.358898944 x = 9.358898944 Simplifying x = 9.358898944

Subproblem 2

x + -5 = -4.358898944 Simplifying x + -5 = -4.358898944 Reorder the terms: -5 + x = -4.358898944 Solving -5 + x = -4.358898944 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = -4.358898944 + 5 Combine like terms: -5 + 5 = 0 0 + x = -4.358898944 + 5 x = -4.358898944 + 5 Combine like terms: -4.358898944 + 5 = 0.641101056 x = 0.641101056 Simplifying x = 0.641101056

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.358898944, 0.641101056}

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