2x^2+x-91=63

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Solution for 2x^2+x-91=63 equation:


Simplifying
2x2 + x + -91 = 63

Reorder the terms:
-91 + x + 2x2 = 63

Solving
-91 + x + 2x2 = 63

Solving for variable 'x'.

Reorder the terms:
-91 + -63 + x + 2x2 = 63 + -63

Combine like terms: -91 + -63 = -154
-154 + x + 2x2 = 63 + -63

Combine like terms: 63 + -63 = 0
-154 + x + 2x2 = 0

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

Divide each side by '2'.
-77 + 0.5x + x2 = 0

Move the constant term to the right:

Add '77' to each side of the equation.
-77 + 0.5x + 77 + x2 = 0 + 77

Reorder the terms:
-77 + 77 + 0.5x + x2 = 0 + 77

Combine like terms: -77 + 77 = 0
0 + 0.5x + x2 = 0 + 77
0.5x + x2 = 0 + 77

Combine like terms: 0 + 77 = 77
0.5x + x2 = 77

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.
0.5x + 0.25 + x2 = 77 + 0.25

Reorder the terms:
0.25 + 0.5x + x2 = 77 + 0.25

Combine like terms: 77 + 0.25 = 77.25
0.25 + 0.5x + x2 = 77.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 77.25

Calculate the square root of the right side: 8.789197916

Break this problem into two subproblems by setting 
(x + 0.5) equal to 8.789197916 and -8.789197916.

Subproblem 1

x + 0.5 = 8.789197916 Simplifying x + 0.5 = 8.789197916 Reorder the terms: 0.5 + x = 8.789197916 Solving 0.5 + x = 8.789197916 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 = 8.789197916 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 8.789197916 + -0.5 x = 8.789197916 + -0.5 Combine like terms: 8.789197916 + -0.5 = 8.289197916 x = 8.289197916 Simplifying x = 8.289197916

Subproblem 2

x + 0.5 = -8.789197916 Simplifying x + 0.5 = -8.789197916 Reorder the terms: 0.5 + x = -8.789197916 Solving 0.5 + x = -8.789197916 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 = -8.789197916 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -8.789197916 + -0.5 x = -8.789197916 + -0.5 Combine like terms: -8.789197916 + -0.5 = -9.289197916 x = -9.289197916 Simplifying x = -9.289197916

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.289197916, -9.289197916}

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