5x^2-9x-36=0

Simple and best practice solution for 5x^2-9x-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 5x^2-9x-36=0 equation:


Simplifying
5x2 + -9x + -36 = 0

Reorder the terms:
-36 + -9x + 5x2 = 0

Solving
-36 + -9x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-7.2 + -1.8x + x2 = 0

Move the constant term to the right:

Add '7.2' to each side of the equation.
-7.2 + -1.8x + 7.2 + x2 = 0 + 7.2

Reorder the terms:
-7.2 + 7.2 + -1.8x + x2 = 0 + 7.2

Combine like terms: -7.2 + 7.2 = 0.0
0.0 + -1.8x + x2 = 0 + 7.2
-1.8x + x2 = 0 + 7.2

Combine like terms: 0 + 7.2 = 7.2
-1.8x + x2 = 7.2

The x term is -1.8x.  Take half its coefficient (-0.9).
Square it (0.81) and add it to both sides.

Add '0.81' to each side of the equation.
-1.8x + 0.81 + x2 = 7.2 + 0.81

Reorder the terms:
0.81 + -1.8x + x2 = 7.2 + 0.81

Combine like terms: 7.2 + 0.81 = 8.01
0.81 + -1.8x + x2 = 8.01

Factor a perfect square on the left side:
(x + -0.9)(x + -0.9) = 8.01

Calculate the square root of the right side: 2.83019434

Break this problem into two subproblems by setting 
(x + -0.9) equal to 2.83019434 and -2.83019434.

Subproblem 1

x + -0.9 = 2.83019434 Simplifying x + -0.9 = 2.83019434 Reorder the terms: -0.9 + x = 2.83019434 Solving -0.9 + x = 2.83019434 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9' to each side of the equation. -0.9 + 0.9 + x = 2.83019434 + 0.9 Combine like terms: -0.9 + 0.9 = 0.0 0.0 + x = 2.83019434 + 0.9 x = 2.83019434 + 0.9 Combine like terms: 2.83019434 + 0.9 = 3.73019434 x = 3.73019434 Simplifying x = 3.73019434

Subproblem 2

x + -0.9 = -2.83019434 Simplifying x + -0.9 = -2.83019434 Reorder the terms: -0.9 + x = -2.83019434 Solving -0.9 + x = -2.83019434 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9' to each side of the equation. -0.9 + 0.9 + x = -2.83019434 + 0.9 Combine like terms: -0.9 + 0.9 = 0.0 0.0 + x = -2.83019434 + 0.9 x = -2.83019434 + 0.9 Combine like terms: -2.83019434 + 0.9 = -1.93019434 x = -1.93019434 Simplifying x = -1.93019434

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.73019434, -1.93019434}

See similar equations:

| 30(p+140)=100p | | 3x+5y=22 | | 12x+4=22 | | 9x+5=-10 | | 30(p+140)=p+140 | | -6n+11=-5n-15 | | 30(p+140)=p | | 6x^2+12x=15 | | x^2+3x-150=0 | | 30(p+140)= | | 6x^4-24x^3+4x^2-16x=0 | | 6(5+c)=5(c-2) | | 28-12=4(x-3) | | 3y+4=3(6-7y) | | .33+.66m=.66m-.66 | | 8x-16y-5x-12y= | | .66x+.33=-1.6 | | 4(4k+1)-8(k-1)=3(2k+2)-2 | | .2x+.2=.4x-1.4 | | 3(x)=508 | | 2x+3=x^2-2x+1 | | .5(x+7)-2=7 | | 4p+9=12 | | D^2-2D=15 | | 7x+3x+12= | | 6x+4=-5+3x+24 | | (0.6x-3)(2x+1)=0 | | -9(x-2)-20=-2 | | 4(4k+1)-8(k-1)=3(25k+2)-2 | | 10m+100=15m | | 11u-u-14+13u= | | -44x=126 |

Equations solver categories