(4x^2+3x-9)+(-9x+10)=0

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Solution for (4x^2+3x-9)+(-9x+10)=0 equation:


Simplifying
(4x2 + 3x + -9) + (-9x + 10) = 0

Reorder the terms:
(-9 + 3x + 4x2) + (-9x + 10) = 0

Remove parenthesis around (-9 + 3x + 4x2)
-9 + 3x + 4x2 + (-9x + 10) = 0

Reorder the terms:
-9 + 3x + 4x2 + (10 + -9x) = 0

Remove parenthesis around (10 + -9x)
-9 + 3x + 4x2 + 10 + -9x = 0

Reorder the terms:
-9 + 10 + 3x + -9x + 4x2 = 0

Combine like terms: -9 + 10 = 1
1 + 3x + -9x + 4x2 = 0

Combine like terms: 3x + -9x = -6x
1 + -6x + 4x2 = 0

Solving
1 + -6x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
0.25 + -1.5x + x2 = 0

Move the constant term to the right:

Add '-0.25' to each side of the equation.
0.25 + -1.5x + -0.25 + x2 = 0 + -0.25

Reorder the terms:
0.25 + -0.25 + -1.5x + x2 = 0 + -0.25

Combine like terms: 0.25 + -0.25 = 0.00
0.00 + -1.5x + x2 = 0 + -0.25
-1.5x + x2 = 0 + -0.25

Combine like terms: 0 + -0.25 = -0.25
-1.5x + x2 = -0.25

The x term is -1.5x.  Take half its coefficient (-0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
-1.5x + 0.5625 + x2 = -0.25 + 0.5625

Reorder the terms:
0.5625 + -1.5x + x2 = -0.25 + 0.5625

Combine like terms: -0.25 + 0.5625 = 0.3125
0.5625 + -1.5x + x2 = 0.3125

Factor a perfect square on the left side:
(x + -0.75)(x + -0.75) = 0.3125

Calculate the square root of the right side: 0.559016994

Break this problem into two subproblems by setting 
(x + -0.75) equal to 0.559016994 and -0.559016994.

Subproblem 1

x + -0.75 = 0.559016994 Simplifying x + -0.75 = 0.559016994 Reorder the terms: -0.75 + x = 0.559016994 Solving -0.75 + x = 0.559016994 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = 0.559016994 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = 0.559016994 + 0.75 x = 0.559016994 + 0.75 Combine like terms: 0.559016994 + 0.75 = 1.309016994 x = 1.309016994 Simplifying x = 1.309016994

Subproblem 2

x + -0.75 = -0.559016994 Simplifying x + -0.75 = -0.559016994 Reorder the terms: -0.75 + x = -0.559016994 Solving -0.75 + x = -0.559016994 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = -0.559016994 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = -0.559016994 + 0.75 x = -0.559016994 + 0.75 Combine like terms: -0.559016994 + 0.75 = 0.190983006 x = 0.190983006 Simplifying x = 0.190983006

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.309016994, 0.190983006}

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