x^2-2x-45=0

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


Simplifying
x2 + -2x + -45 = 0

Reorder the terms:
-45 + -2x + x2 = 0

Solving
-45 + -2x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '45' to each side of the equation.
-45 + -2x + 45 + x2 = 0 + 45

Reorder the terms:
-45 + 45 + -2x + x2 = 0 + 45

Combine like terms: -45 + 45 = 0
0 + -2x + x2 = 0 + 45
-2x + x2 = 0 + 45

Combine like terms: 0 + 45 = 45
-2x + x2 = 45

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = 45 + 1

Reorder the terms:
1 + -2x + x2 = 45 + 1

Combine like terms: 45 + 1 = 46
1 + -2x + x2 = 46

Factor a perfect square on the left side:
(x + -1)(x + -1) = 46

Calculate the square root of the right side: 6.782329983

Break this problem into two subproblems by setting 
(x + -1) equal to 6.782329983 and -6.782329983.

Subproblem 1

x + -1 = 6.782329983 Simplifying x + -1 = 6.782329983 Reorder the terms: -1 + x = 6.782329983 Solving -1 + x = 6.782329983 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 6.782329983 + 1 Combine like terms: -1 + 1 = 0 0 + x = 6.782329983 + 1 x = 6.782329983 + 1 Combine like terms: 6.782329983 + 1 = 7.782329983 x = 7.782329983 Simplifying x = 7.782329983

Subproblem 2

x + -1 = -6.782329983 Simplifying x + -1 = -6.782329983 Reorder the terms: -1 + x = -6.782329983 Solving -1 + x = -6.782329983 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -6.782329983 + 1 Combine like terms: -1 + 1 = 0 0 + x = -6.782329983 + 1 x = -6.782329983 + 1 Combine like terms: -6.782329983 + 1 = -5.782329983 x = -5.782329983 Simplifying x = -5.782329983

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.782329983, -5.782329983}

See similar equations:

| |x-2|+4=2 | | 6(4-x)=2x | | 9x^5+x-1=0 | | 15p+p=7-p | | 4x+9=5x+11 | | (15p).4=660 | | Y-4=20 | | 180-x-4x=56 | | -0.5x^2+33.528x-100=0 | | 5k+ar=r-8y | | -0.5x^2+33.528x-100= | | 2x-15=x | | 4(2m+5)=3m+5 | | x+7.9=9.9 | | 4x+9+4x+8+4x=4x+5x+3+4x | | 4w-5w-w= | | x^2+14x+32=0 | | 8x-2=3x-12.25 | | 7y=20+5y | | 4|z-5|+4=24 | | 3(c++4)=-8 | | K-1.8=-7.5 | | x+40=2y | | 6p-(3p+5)-9=3(p-3) | | -48-6y=2 | | (2x^2)-x=15 | | k*11=44 | | 6m=45 | | 2t+5t=21 | | 9+2x-2=-2 | | |z-6|-8=4 | | 3(2n-6)+1=3-(20-6n) |

Equations solver categories