4x^2+9=51-x

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Solution for 4x^2+9=51-x equation:


Simplifying
4x2 + 9 = 51 + -1x

Reorder the terms:
9 + 4x2 = 51 + -1x

Solving
9 + 4x2 = 51 + -1x

Solving for variable 'x'.

Reorder the terms:
9 + -51 + x + 4x2 = 51 + -1x + -51 + x

Combine like terms: 9 + -51 = -42
-42 + x + 4x2 = 51 + -1x + -51 + x

Reorder the terms:
-42 + x + 4x2 = 51 + -51 + -1x + x

Combine like terms: 51 + -51 = 0
-42 + x + 4x2 = 0 + -1x + x
-42 + x + 4x2 = -1x + x

Combine like terms: -1x + x = 0
-42 + x + 4x2 = 0

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

Divide each side by '4'.
-10.5 + 0.25x + x2 = 0

Move the constant term to the right:

Add '10.5' to each side of the equation.
-10.5 + 0.25x + 10.5 + x2 = 0 + 10.5

Reorder the terms:
-10.5 + 10.5 + 0.25x + x2 = 0 + 10.5

Combine like terms: -10.5 + 10.5 = 0.0
0.0 + 0.25x + x2 = 0 + 10.5
0.25x + x2 = 0 + 10.5

Combine like terms: 0 + 10.5 = 10.5
0.25x + x2 = 10.5

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
0.25x + 0.25 + x2 = 10.5 + 0.25

Reorder the terms:
0.25 + 0.25x + x2 = 10.5 + 0.25

Combine like terms: 10.5 + 0.25 = 10.75
0.25 + 0.25x + x2 = 10.75

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 10.75

Calculate the square root of the right side: 3.278719262

Break this problem into two subproblems by setting 
(x + 0.5) equal to 3.278719262 and -3.278719262.

Subproblem 1

x + 0.5 = 3.278719262 Simplifying x + 0.5 = 3.278719262 Reorder the terms: 0.5 + x = 3.278719262 Solving 0.5 + x = 3.278719262 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 3.278719262 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 3.278719262 + -0.5 x = 3.278719262 + -0.5 Combine like terms: 3.278719262 + -0.5 = 2.778719262 x = 2.778719262 Simplifying x = 2.778719262

Subproblem 2

x + 0.5 = -3.278719262 Simplifying x + 0.5 = -3.278719262 Reorder the terms: 0.5 + x = -3.278719262 Solving 0.5 + x = -3.278719262 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -3.278719262 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -3.278719262 + -0.5 x = -3.278719262 + -0.5 Combine like terms: -3.278719262 + -0.5 = -3.778719262 x = -3.778719262 Simplifying x = -3.778719262

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.778719262, -3.778719262}

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