x(x-2)+(x+1)=4

Simple and best practice solution for x(x-2)+(x+1)=4 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(x-2)+(x+1)=4 equation:


Simplifying
x(x + -2) + (x + 1) = 4

Reorder the terms:
x(-2 + x) + (x + 1) = 4
(-2 * x + x * x) + (x + 1) = 4
(-2x + x2) + (x + 1) = 4

Reorder the terms:
-2x + x2 + (1 + x) = 4

Remove parenthesis around (1 + x)
-2x + x2 + 1 + x = 4

Reorder the terms:
1 + -2x + x + x2 = 4

Combine like terms: -2x + x = -1x
1 + -1x + x2 = 4

Solving
1 + -1x + x2 = 4

Solving for variable 'x'.

Reorder the terms:
1 + -4 + -1x + x2 = 4 + -4

Combine like terms: 1 + -4 = -3
-3 + -1x + x2 = 4 + -4

Combine like terms: 4 + -4 = 0
-3 + -1x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + -1x + 3 + x2 = 0 + 3

Reorder the terms:
-3 + 3 + -1x + x2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -1x + x2 = 0 + 3
-1x + x2 = 0 + 3

Combine like terms: 0 + 3 = 3
-1x + x2 = 3

The x term is -1x.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1x + 0.25 + x2 = 3 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 3 + 0.25

Combine like terms: 3 + 0.25 = 3.25
0.25 + -1x + x2 = 3.25

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 3.25

Calculate the square root of the right side: 1.802775638

Break this problem into two subproblems by setting 
(x + -0.5) equal to 1.802775638 and -1.802775638.

Subproblem 1

x + -0.5 = 1.802775638 Simplifying x + -0.5 = 1.802775638 Reorder the terms: -0.5 + x = 1.802775638 Solving -0.5 + x = 1.802775638 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = 1.802775638 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 1.802775638 + 0.5 x = 1.802775638 + 0.5 Combine like terms: 1.802775638 + 0.5 = 2.302775638 x = 2.302775638 Simplifying x = 2.302775638

Subproblem 2

x + -0.5 = -1.802775638 Simplifying x + -0.5 = -1.802775638 Reorder the terms: -0.5 + x = -1.802775638 Solving -0.5 + x = -1.802775638 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = -1.802775638 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -1.802775638 + 0.5 x = -1.802775638 + 0.5 Combine like terms: -1.802775638 + 0.5 = -1.302775638 x = -1.302775638 Simplifying x = -1.302775638

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.302775638, -1.302775638}

See similar equations:

| 5-3g=14 | | 20x^4+3x^3+71x^2+12x-36=0 | | 3p+4q=27 | | x^4+7x^2-144=0 | | x-5.6=7.8 | | 12x+6=1x+16 | | x+1.10=-4.5 | | 2x+180+12x=67 | | x+2.3=3 | | 2(x+80)+12x=67 | | -25+p=-40 | | 7y=12-2y | | 4(y-2)+3(y-12)=-2(Y+28) | | 2x^2+11-1=0 | | x^3+8x=15x-x^3+20 | | (y-2)(y+2)=0 | | 2x^2-15x-50=0 | | 4y-(y+7)=9 | | -7x-1=22 | | 6x^2+7x=5 | | x+1.8-1.8=-1.4-1.8 | | 15x^2-16x+4= | | (6y^3-2y^2+10)-(-2y^3+4y^2+y-2)=0 | | (6y^3-2y^2+10y)-(-2y^3+4y^2+y-2)=0 | | x^5-5x^3+x^2+4x+2=0 | | 9(5-2(x-1))=21+6(x+3) | | -25=s(b-3) | | 17.4+x=7 | | 14p-5=-3p+114 | | 5x+25=x+2 | | 4y+1-y=1+y | | -2+14=15x-5-14x |

Equations solver categories