9x^2+4x-36=0

Simple and best practice solution for 9x^2+4x-36=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+4x-36=0 equation:


Simplifying
9x2 + 4x + -36 = 0

Reorder the terms:
-36 + 4x + 9x2 = 0

Solving
-36 + 4x + 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'.
-4 + 0.4444444444x + x2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + 0.4444444444x + 4 + x2 = 0 + 4

Reorder the terms:
-4 + 4 + 0.4444444444x + x2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + 0.4444444444x + x2 = 0 + 4
0.4444444444x + x2 = 0 + 4

Combine like terms: 0 + 4 = 4
0.4444444444x + x2 = 4

The x term is 0.4444444444x.  Take half its coefficient (0.2222222222).
Square it (0.04938271604) and add it to both sides.

Add '0.04938271604' to each side of the equation.
0.4444444444x + 0.04938271604 + x2 = 4 + 0.04938271604

Reorder the terms:
0.04938271604 + 0.4444444444x + x2 = 4 + 0.04938271604

Combine like terms: 4 + 0.04938271604 = 4.04938271604
0.04938271604 + 0.4444444444x + x2 = 4.04938271604

Factor a perfect square on the left side:
(x + 0.2222222222)(x + 0.2222222222) = 4.04938271604

Calculate the square root of the right side: 2.012307808

Break this problem into two subproblems by setting 
(x + 0.2222222222) equal to 2.012307808 and -2.012307808.

Subproblem 1

x + 0.2222222222 = 2.012307808 Simplifying x + 0.2222222222 = 2.012307808 Reorder the terms: 0.2222222222 + x = 2.012307808 Solving 0.2222222222 + x = 2.012307808 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2222222222' to each side of the equation. 0.2222222222 + -0.2222222222 + x = 2.012307808 + -0.2222222222 Combine like terms: 0.2222222222 + -0.2222222222 = 0.0000000000 0.0000000000 + x = 2.012307808 + -0.2222222222 x = 2.012307808 + -0.2222222222 Combine like terms: 2.012307808 + -0.2222222222 = 1.7900855858 x = 1.7900855858 Simplifying x = 1.7900855858

Subproblem 2

x + 0.2222222222 = -2.012307808 Simplifying x + 0.2222222222 = -2.012307808 Reorder the terms: 0.2222222222 + x = -2.012307808 Solving 0.2222222222 + x = -2.012307808 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2222222222' to each side of the equation. 0.2222222222 + -0.2222222222 + x = -2.012307808 + -0.2222222222 Combine like terms: 0.2222222222 + -0.2222222222 = 0.0000000000 0.0000000000 + x = -2.012307808 + -0.2222222222 x = -2.012307808 + -0.2222222222 Combine like terms: -2.012307808 + -0.2222222222 = -2.2345300302 x = -2.2345300302 Simplifying x = -2.2345300302

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.7900855858, -2.2345300302}

See similar equations:

| 1-(3b-15)=6(2b+5) | | 5-b=23 | | -12x+8=-32 | | 11(x-2)+2[x-3(x+1)]=0 | | -6(3+x)+3x=5(x-10) | | 6.8x=99.96 | | 3y+10+5=3(y+5) | | 10y=9 | | 40+15+.25h=45+45+.35 | | -6z=30 | | X+74=70 | | 1.49r=24 | | X+74=79 | | -8(2-x)=-5(2x+2) | | 17=2+r | | 5b(a+5)-a(5-b)+3(a+b-2)= | | -8(2-x)=-5(2x+2)-15 | | 7x-4(x-2)+6=-16 | | 3(y-1)-6=0 | | -2(x-7)-6=-(11x-8) | | -2k+11=7 | | 55x+.25=100 | | 28-19=3(y-6) | | (2x+1)(x+5)=3 | | 2t=-1 | | -11-x+5x=x-1-1 | | -95-9x=175+-6x | | 29-19=3(y-6) | | 2/5(9-2b)=-14 | | 8y+2=y-15 | | -9x+14=4x-12 | | -16y-20=-14y+40 |

Equations solver categories