4x^2-45x+91=0

Simple and best practice solution for 4x^2-45x+91=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 4x^2-45x+91=0 equation:


Simplifying
4x2 + -45x + 91 = 0

Reorder the terms:
91 + -45x + 4x2 = 0

Solving
91 + -45x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
22.75 + -11.25x + x2 = 0

Move the constant term to the right:

Add '-22.75' to each side of the equation.
22.75 + -11.25x + -22.75 + x2 = 0 + -22.75

Reorder the terms:
22.75 + -22.75 + -11.25x + x2 = 0 + -22.75

Combine like terms: 22.75 + -22.75 = 0.00
0.00 + -11.25x + x2 = 0 + -22.75
-11.25x + x2 = 0 + -22.75

Combine like terms: 0 + -22.75 = -22.75
-11.25x + x2 = -22.75

The x term is -11.25x.  Take half its coefficient (-5.625).
Square it (31.640625) and add it to both sides.

Add '31.640625' to each side of the equation.
-11.25x + 31.640625 + x2 = -22.75 + 31.640625

Reorder the terms:
31.640625 + -11.25x + x2 = -22.75 + 31.640625

Combine like terms: -22.75 + 31.640625 = 8.890625
31.640625 + -11.25x + x2 = 8.890625

Factor a perfect square on the left side:
(x + -5.625)(x + -5.625) = 8.890625

Calculate the square root of the right side: 2.98171511

Break this problem into two subproblems by setting 
(x + -5.625) equal to 2.98171511 and -2.98171511.

Subproblem 1

x + -5.625 = 2.98171511 Simplifying x + -5.625 = 2.98171511 Reorder the terms: -5.625 + x = 2.98171511 Solving -5.625 + x = 2.98171511 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.625' to each side of the equation. -5.625 + 5.625 + x = 2.98171511 + 5.625 Combine like terms: -5.625 + 5.625 = 0.000 0.000 + x = 2.98171511 + 5.625 x = 2.98171511 + 5.625 Combine like terms: 2.98171511 + 5.625 = 8.60671511 x = 8.60671511 Simplifying x = 8.60671511

Subproblem 2

x + -5.625 = -2.98171511 Simplifying x + -5.625 = -2.98171511 Reorder the terms: -5.625 + x = -2.98171511 Solving -5.625 + x = -2.98171511 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.625' to each side of the equation. -5.625 + 5.625 + x = -2.98171511 + 5.625 Combine like terms: -5.625 + 5.625 = 0.000 0.000 + x = -2.98171511 + 5.625 x = -2.98171511 + 5.625 Combine like terms: -2.98171511 + 5.625 = 2.64328489 x = 2.64328489 Simplifying x = 2.64328489

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.60671511, 2.64328489}

See similar equations:

| 16p+12q+p-7q-4p= | | 4x^2-45n+91=0 | | Y=2(-4)+5 | | ((30-x)/10)^2 | | 56=7x(2-3p) | | 12x+21=11x+30 | | 5x=x+18 | | 5(3r+3)=6(5r-5) | | 56/2/8 | | 24000p+3=234p-2 | | 5C+2C+3y+y= | | 2x^2+18x+17=0 | | 4X^4-52X^3+12X-55=0 | | 5x=3x+30 | | 5+3=158 | | (12n-40)-(10n+30)=n+10 | | 5x-3-5(2-3x)=7 | | 3x+7y+2x+y= | | 2(x+3)=3(2x-7) | | 6+6x=-4+x | | 6x-9x^2y= | | X=-4/-2 | | 7x-20=6x+10 | | (13n+5)-(3n+6)=99 | | 10x-3x-21=7 | | 8x+9y=840 | | 544=9+9y | | 48x+20y=40 | | -4=s/8 | | 5r=-10 | | 90=q/9 | | Y=sinx*3x |

Equations solver categories