9x+5=4x^2-1

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Solution for 9x+5=4x^2-1 equation:


Simplifying
9x + 5 = 4x2 + -1

Reorder the terms:
5 + 9x = 4x2 + -1

Reorder the terms:
5 + 9x = -1 + 4x2

Solving
5 + 9x = -1 + 4x2

Solving for variable 'x'.

Reorder the terms:
5 + 1 + 9x + -4x2 = -1 + 4x2 + 1 + -4x2

Combine like terms: 5 + 1 = 6
6 + 9x + -4x2 = -1 + 4x2 + 1 + -4x2

Reorder the terms:
6 + 9x + -4x2 = -1 + 1 + 4x2 + -4x2

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

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

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

Divide each side by '-4'.
-1.5 + -2.25x + x2 = 0

Move the constant term to the right:

Add '1.5' to each side of the equation.
-1.5 + -2.25x + 1.5 + x2 = 0 + 1.5

Reorder the terms:
-1.5 + 1.5 + -2.25x + x2 = 0 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + -2.25x + x2 = 0 + 1.5
-2.25x + x2 = 0 + 1.5

Combine like terms: 0 + 1.5 = 1.5
-2.25x + x2 = 1.5

The x term is -2.25x.  Take half its coefficient (-1.125).
Square it (1.265625) and add it to both sides.

Add '1.265625' to each side of the equation.
-2.25x + 1.265625 + x2 = 1.5 + 1.265625

Reorder the terms:
1.265625 + -2.25x + x2 = 1.5 + 1.265625

Combine like terms: 1.5 + 1.265625 = 2.765625
1.265625 + -2.25x + x2 = 2.765625

Factor a perfect square on the left side:
(x + -1.125)(x + -1.125) = 2.765625

Calculate the square root of the right side: 1.663016837

Break this problem into two subproblems by setting 
(x + -1.125) equal to 1.663016837 and -1.663016837.

Subproblem 1

x + -1.125 = 1.663016837 Simplifying x + -1.125 = 1.663016837 Reorder the terms: -1.125 + x = 1.663016837 Solving -1.125 + x = 1.663016837 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.125' to each side of the equation. -1.125 + 1.125 + x = 1.663016837 + 1.125 Combine like terms: -1.125 + 1.125 = 0.000 0.000 + x = 1.663016837 + 1.125 x = 1.663016837 + 1.125 Combine like terms: 1.663016837 + 1.125 = 2.788016837 x = 2.788016837 Simplifying x = 2.788016837

Subproblem 2

x + -1.125 = -1.663016837 Simplifying x + -1.125 = -1.663016837 Reorder the terms: -1.125 + x = -1.663016837 Solving -1.125 + x = -1.663016837 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.125' to each side of the equation. -1.125 + 1.125 + x = -1.663016837 + 1.125 Combine like terms: -1.125 + 1.125 = 0.000 0.000 + x = -1.663016837 + 1.125 x = -1.663016837 + 1.125 Combine like terms: -1.663016837 + 1.125 = -0.538016837 x = -0.538016837 Simplifying x = -0.538016837

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.788016837, -0.538016837}

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