4x^2-2x+8=9x+3

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Solution for 4x^2-2x+8=9x+3 equation:


Simplifying
4x2 + -2x + 8 = 9x + 3

Reorder the terms:
8 + -2x + 4x2 = 9x + 3

Reorder the terms:
8 + -2x + 4x2 = 3 + 9x

Solving
8 + -2x + 4x2 = 3 + 9x

Solving for variable 'x'.

Reorder the terms:
8 + -3 + -2x + -9x + 4x2 = 3 + 9x + -3 + -9x

Combine like terms: 8 + -3 = 5
5 + -2x + -9x + 4x2 = 3 + 9x + -3 + -9x

Combine like terms: -2x + -9x = -11x
5 + -11x + 4x2 = 3 + 9x + -3 + -9x

Reorder the terms:
5 + -11x + 4x2 = 3 + -3 + 9x + -9x

Combine like terms: 3 + -3 = 0
5 + -11x + 4x2 = 0 + 9x + -9x
5 + -11x + 4x2 = 9x + -9x

Combine like terms: 9x + -9x = 0
5 + -11x + 4x2 = 0

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

Divide each side by '4'.
1.25 + -2.75x + x2 = 0

Move the constant term to the right:

Add '-1.25' to each side of the equation.
1.25 + -2.75x + -1.25 + x2 = 0 + -1.25

Reorder the terms:
1.25 + -1.25 + -2.75x + x2 = 0 + -1.25

Combine like terms: 1.25 + -1.25 = 0.00
0.00 + -2.75x + x2 = 0 + -1.25
-2.75x + x2 = 0 + -1.25

Combine like terms: 0 + -1.25 = -1.25
-2.75x + x2 = -1.25

The x term is -2.75x.  Take half its coefficient (-1.375).
Square it (1.890625) and add it to both sides.

Add '1.890625' to each side of the equation.
-2.75x + 1.890625 + x2 = -1.25 + 1.890625

Reorder the terms:
1.890625 + -2.75x + x2 = -1.25 + 1.890625

Combine like terms: -1.25 + 1.890625 = 0.640625
1.890625 + -2.75x + x2 = 0.640625

Factor a perfect square on the left side:
(x + -1.375)(x + -1.375) = 0.640625

Calculate the square root of the right side: 0.80039053

Break this problem into two subproblems by setting 
(x + -1.375) equal to 0.80039053 and -0.80039053.

Subproblem 1

x + -1.375 = 0.80039053 Simplifying x + -1.375 = 0.80039053 Reorder the terms: -1.375 + x = 0.80039053 Solving -1.375 + x = 0.80039053 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.375' to each side of the equation. -1.375 + 1.375 + x = 0.80039053 + 1.375 Combine like terms: -1.375 + 1.375 = 0.000 0.000 + x = 0.80039053 + 1.375 x = 0.80039053 + 1.375 Combine like terms: 0.80039053 + 1.375 = 2.17539053 x = 2.17539053 Simplifying x = 2.17539053

Subproblem 2

x + -1.375 = -0.80039053 Simplifying x + -1.375 = -0.80039053 Reorder the terms: -1.375 + x = -0.80039053 Solving -1.375 + x = -0.80039053 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.375' to each side of the equation. -1.375 + 1.375 + x = -0.80039053 + 1.375 Combine like terms: -1.375 + 1.375 = 0.000 0.000 + x = -0.80039053 + 1.375 x = -0.80039053 + 1.375 Combine like terms: -0.80039053 + 1.375 = 0.57460947 x = 0.57460947 Simplifying x = 0.57460947

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.17539053, 0.57460947}

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