9x^2-17x-18=0

Simple and best practice solution for 9x^2-17x-18=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 9x^2-17x-18=0 equation:


Simplifying
9x2 + -17x + -18 = 0

Reorder the terms:
-18 + -17x + 9x2 = 0

Solving
-18 + -17x + 9x2 = 0

Solving for variable 'x'.

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

Divide each side by '9'.
-2 + -1.888888889x + x2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + -1.888888889x + 2 + x2 = 0 + 2

Reorder the terms:
-2 + 2 + -1.888888889x + x2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -1.888888889x + x2 = 0 + 2
-1.888888889x + x2 = 0 + 2

Combine like terms: 0 + 2 = 2
-1.888888889x + x2 = 2

The x term is -1.888888889x.  Take half its coefficient (-0.9444444445).
Square it (0.8919753087) and add it to both sides.

Add '0.8919753087' to each side of the equation.
-1.888888889x + 0.8919753087 + x2 = 2 + 0.8919753087

Reorder the terms:
0.8919753087 + -1.888888889x + x2 = 2 + 0.8919753087

Combine like terms: 2 + 0.8919753087 = 2.8919753087
0.8919753087 + -1.888888889x + x2 = 2.8919753087

Factor a perfect square on the left side:
(x + -0.9444444445)(x + -0.9444444445) = 2.8919753087

Calculate the square root of the right side: 1.700580874

Break this problem into two subproblems by setting 
(x + -0.9444444445) equal to 1.700580874 and -1.700580874.

Subproblem 1

x + -0.9444444445 = 1.700580874 Simplifying x + -0.9444444445 = 1.700580874 Reorder the terms: -0.9444444445 + x = 1.700580874 Solving -0.9444444445 + x = 1.700580874 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9444444445' to each side of the equation. -0.9444444445 + 0.9444444445 + x = 1.700580874 + 0.9444444445 Combine like terms: -0.9444444445 + 0.9444444445 = 0.0000000000 0.0000000000 + x = 1.700580874 + 0.9444444445 x = 1.700580874 + 0.9444444445 Combine like terms: 1.700580874 + 0.9444444445 = 2.6450253185 x = 2.6450253185 Simplifying x = 2.6450253185

Subproblem 2

x + -0.9444444445 = -1.700580874 Simplifying x + -0.9444444445 = -1.700580874 Reorder the terms: -0.9444444445 + x = -1.700580874 Solving -0.9444444445 + x = -1.700580874 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9444444445' to each side of the equation. -0.9444444445 + 0.9444444445 + x = -1.700580874 + 0.9444444445 Combine like terms: -0.9444444445 + 0.9444444445 = 0.0000000000 0.0000000000 + x = -1.700580874 + 0.9444444445 x = -1.700580874 + 0.9444444445 Combine like terms: -1.700580874 + 0.9444444445 = -0.7561364295 x = -0.7561364295 Simplifying x = -0.7561364295

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.6450253185, -0.7561364295}

See similar equations:

| -t=-15 | | 0.5=n-0.625 | | 3.5x-6=58.5 | | M^2+10mn+24n^2=0 | | x=4+4(-3) | | 5x-4y+0=0 | | 5v+5g+m=s | | 2(w+4)=3(w-5) | | 3f=-15 | | 28=-2q | | 2x-6=3c | | y=12+-0.5x | | -e=-12 | | 1/2+m=2.5 | | -4(w-3)=16 | | 5x-3=12-87 | | -5.6+0.8y=4+4y | | c=5.5x+50 | | 5(2y+2)+7y=17(y+5)+26 | | -28+47*x=207 | | 48n+36=-7+5n | | 50w-100=0 | | 5x+5y+9z-2x+5z-8y= | | 5+2(x-3)=x-14 | | (x+28)+3x=90 | | 5+8x=5x+7 | | Y=49-7 | | 3(y+7)=28 | | 4(2w+6)-10= | | -6(p+10)-3(2p+12)=-4p+4 | | f-=8 | | 5-3(2x+7)=9(x-4) |

Equations solver categories