15x+10=4x^2-12x+9

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Solution for 15x+10=4x^2-12x+9 equation:


Simplifying
15x + 10 = 4x2 + -12x + 9

Reorder the terms:
10 + 15x = 4x2 + -12x + 9

Reorder the terms:
10 + 15x = 9 + -12x + 4x2

Solving
10 + 15x = 9 + -12x + 4x2

Solving for variable 'x'.

Reorder the terms:
10 + -9 + 15x + 12x + -4x2 = 9 + -12x + 4x2 + -9 + 12x + -4x2

Combine like terms: 10 + -9 = 1
1 + 15x + 12x + -4x2 = 9 + -12x + 4x2 + -9 + 12x + -4x2

Combine like terms: 15x + 12x = 27x
1 + 27x + -4x2 = 9 + -12x + 4x2 + -9 + 12x + -4x2

Reorder the terms:
1 + 27x + -4x2 = 9 + -9 + -12x + 12x + 4x2 + -4x2

Combine like terms: 9 + -9 = 0
1 + 27x + -4x2 = 0 + -12x + 12x + 4x2 + -4x2
1 + 27x + -4x2 = -12x + 12x + 4x2 + -4x2

Combine like terms: -12x + 12x = 0
1 + 27x + -4x2 = 0 + 4x2 + -4x2
1 + 27x + -4x2 = 4x2 + -4x2

Combine like terms: 4x2 + -4x2 = 0
1 + 27x + -4x2 = 0

Begin completing the square.  Divide all terms by
-4 the coefficient of the squared term: 

Divide each side by '-4'.
-0.25 + -6.75x + x2 = 0

Move the constant term to the right:

Add '0.25' to each side of the equation.
-0.25 + -6.75x + 0.25 + x2 = 0 + 0.25

Reorder the terms:
-0.25 + 0.25 + -6.75x + x2 = 0 + 0.25

Combine like terms: -0.25 + 0.25 = 0.00
0.00 + -6.75x + x2 = 0 + 0.25
-6.75x + x2 = 0 + 0.25

Combine like terms: 0 + 0.25 = 0.25
-6.75x + x2 = 0.25

The x term is -6.75x.  Take half its coefficient (-3.375).
Square it (11.390625) and add it to both sides.

Add '11.390625' to each side of the equation.
-6.75x + 11.390625 + x2 = 0.25 + 11.390625

Reorder the terms:
11.390625 + -6.75x + x2 = 0.25 + 11.390625

Combine like terms: 0.25 + 11.390625 = 11.640625
11.390625 + -6.75x + x2 = 11.640625

Factor a perfect square on the left side:
(x + -3.375)(x + -3.375) = 11.640625

Calculate the square root of the right side: 3.411836016

Break this problem into two subproblems by setting 
(x + -3.375) equal to 3.411836016 and -3.411836016.

Subproblem 1

x + -3.375 = 3.411836016 Simplifying x + -3.375 = 3.411836016 Reorder the terms: -3.375 + x = 3.411836016 Solving -3.375 + x = 3.411836016 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.375' to each side of the equation. -3.375 + 3.375 + x = 3.411836016 + 3.375 Combine like terms: -3.375 + 3.375 = 0.000 0.000 + x = 3.411836016 + 3.375 x = 3.411836016 + 3.375 Combine like terms: 3.411836016 + 3.375 = 6.786836016 x = 6.786836016 Simplifying x = 6.786836016

Subproblem 2

x + -3.375 = -3.411836016 Simplifying x + -3.375 = -3.411836016 Reorder the terms: -3.375 + x = -3.411836016 Solving -3.375 + x = -3.411836016 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.375' to each side of the equation. -3.375 + 3.375 + x = -3.411836016 + 3.375 Combine like terms: -3.375 + 3.375 = 0.000 0.000 + x = -3.411836016 + 3.375 x = -3.411836016 + 3.375 Combine like terms: -3.411836016 + 3.375 = -0.036836016 x = -0.036836016 Simplifying x = -0.036836016

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.786836016, -0.036836016}

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