2x^2-1-9x-1-5=0

Simple and best practice solution for 2x^2-1-9x-1-5=0 equation. Check how easy it is, and learn it for the future. Our solution is simple, and easy to understand, so don`t hesitate to use it as a solution of your homework.

If it's not what You are looking for type in the equation solver your own equation and let us solve it.

Solution for 2x^2-1-9x-1-5=0 equation:


Simplifying
2x2 + -1 + -9x + -1 + -5 = 0

Reorder the terms:
-1 + -1 + -5 + -9x + 2x2 = 0

Combine like terms: -1 + -1 = -2
-2 + -5 + -9x + 2x2 = 0

Combine like terms: -2 + -5 = -7
-7 + -9x + 2x2 = 0

Solving
-7 + -9x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-3.5 + -4.5x + x2 = 0

Move the constant term to the right:

Add '3.5' to each side of the equation.
-3.5 + -4.5x + 3.5 + x2 = 0 + 3.5

Reorder the terms:
-3.5 + 3.5 + -4.5x + x2 = 0 + 3.5

Combine like terms: -3.5 + 3.5 = 0.0
0.0 + -4.5x + x2 = 0 + 3.5
-4.5x + x2 = 0 + 3.5

Combine like terms: 0 + 3.5 = 3.5
-4.5x + x2 = 3.5

The x term is -4.5x.  Take half its coefficient (-2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
-4.5x + 5.0625 + x2 = 3.5 + 5.0625

Reorder the terms:
5.0625 + -4.5x + x2 = 3.5 + 5.0625

Combine like terms: 3.5 + 5.0625 = 8.5625
5.0625 + -4.5x + x2 = 8.5625

Factor a perfect square on the left side:
(x + -2.25)(x + -2.25) = 8.5625

Calculate the square root of the right side: 2.926174978

Break this problem into two subproblems by setting 
(x + -2.25) equal to 2.926174978 and -2.926174978.

Subproblem 1

x + -2.25 = 2.926174978 Simplifying x + -2.25 = 2.926174978 Reorder the terms: -2.25 + x = 2.926174978 Solving -2.25 + x = 2.926174978 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x = 2.926174978 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = 2.926174978 + 2.25 x = 2.926174978 + 2.25 Combine like terms: 2.926174978 + 2.25 = 5.176174978 x = 5.176174978 Simplifying x = 5.176174978

Subproblem 2

x + -2.25 = -2.926174978 Simplifying x + -2.25 = -2.926174978 Reorder the terms: -2.25 + x = -2.926174978 Solving -2.25 + x = -2.926174978 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x = -2.926174978 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = -2.926174978 + 2.25 x = -2.926174978 + 2.25 Combine like terms: -2.926174978 + 2.25 = -0.676174978 x = -0.676174978 Simplifying x = -0.676174978

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.176174978, -0.676174978}

See similar equations:

| 2a^2-3a-20=o | | 10b-3=8b-5 | | x+15=51 | | 4x-11=-4-2x | | x+12=63 | | 6x(5-2)= | | x+5=98 | | .8x+.4y=12 | | 8x-4=4x-24 | | -5(4p+3)-31=3(5p+8) | | x+7=66 | | 77=5x+6x | | 2/3x+1/2=7/12 | | -6x=4x+12 | | 0.8x+0.4y=11 | | -26.6=-3.8f | | x+13=98 | | 2(3n-1)=22 | | X^2+576=1296-72x+x^2 | | x+9=107 | | g-720=75 | | 8-5n+3n=35-69 | | 24+4.5x=y | | x^3-8x+6=0 | | -7(5+2a)=-4a-11(a+5) | | 84x^4+88x^3-96x^2=0 | | h-720=159 | | 6x-10-2x-8= | | -0.5x=70 | | -2(x+7)+52=4x-6(x+3) | | y=4*-3+45 | | y=4(2a+3b) |

Equations solver categories