-x^2+x+3=0

Simple and best practice solution for -x^2+x+3=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+x+3=0 equation:


Simplifying
-1x2 + x + 3 = 0

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

Solving
3 + x + -1x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-3 + -1x + x2 = 0

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 x.  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 = 1.302775638 x = 1.302775638 Simplifying x = 1.302775638

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 = -2.302775638 x = -2.302775638 Simplifying x = -2.302775638

Solution

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

See similar equations:

| -x+x+3=0 | | 9x+3x-9x=6+8x+11 | | (3w+4)(2w^2+5w-6)= | | 2x+9+2x=-23 | | 0xX=1 | | 3(0)=0 | | 5x+400+9=19 | | x*x-2=0 | | 5x+2=88 | | 120=47.38+0.617x | | y=47.38+0.617x | | r^2-10r+30=0 | | (3x+5)(x-11)=0 | | -5.2m-7.7-1m=-7.9-6.2m-0.2 | | 0.3(0.3(-7)+0.8)=-.3 | | 2x+3=52 | | 3x=x+10+40 | | 2s+3t=27 | | 6x-5=7(x-2) | | 6x-41=25 | | 11x-23=30-8x | | 2+14x-40=11-3x+2x | | (x+3i)(x+3i)=2yi | | 3(2x+1)-4x=2x+3 | | -3=8+4x | | 7x+8y-9=0 | | 3x-6.3=7.5 | | 8(x-5)=4x-4 | | 9+7*2= | | .666x+6=.5x+.25x | | 3x-8=-3x+28 | | 4x-7y+5=0 |

Equations solver categories