-x^2+4x=8

Simple and best practice solution for -x^2+4x=8 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+4x=8 equation:


Simplifying
-1x2 + 4x = 8

Reorder the terms:
4x + -1x2 = 8

Solving
4x + -1x2 = 8

Solving for variable 'x'.

Reorder the terms:
-8 + 4x + -1x2 = 8 + -8

Combine like terms: 8 + -8 = 0
-8 + 4x + -1x2 = 0

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

Divide each side by '-1'.
8 + -4x + x2 = 0

Move the constant term to the right:

Add '-8' to each side of the equation.
8 + -4x + -8 + x2 = 0 + -8

Reorder the terms:
8 + -8 + -4x + x2 = 0 + -8

Combine like terms: 8 + -8 = 0
0 + -4x + x2 = 0 + -8
-4x + x2 = 0 + -8

Combine like terms: 0 + -8 = -8
-4x + x2 = -8

The x term is -4x.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x + 4 + x2 = -8 + 4

Reorder the terms:
4 + -4x + x2 = -8 + 4

Combine like terms: -8 + 4 = -4
4 + -4x + x2 = -4

Factor a perfect square on the left side:
(x + -2)(x + -2) = -4

Can't calculate square root of the right side.

The solution to this equation could not be determined.

See similar equations:

| 49.99c+12=235.99 | | -48+12x+x^2=0 | | 3.6-9x=0 | | ln(x+4)+ln(x+1)=ln(3) | | 30X+30(1.5x)=750 | | 235.99-49.99=12c | | 3x^2+15x-15y-3y^2=0 | | 3x^2y^2=4x^2-4xy | | 49.99+12c=235.99 | | 4t+9=5(t-7) | | 2(-x+3)=-4(-x-12) | | 500-20+30-10-5=100 | | x^7/x^9 | | 3(2x-4)+5=5x+2 | | 105x+9.50=14.75x | | 9/14-9/14 | | 20-y=14 | | 2q-6= | | 2x=(x+10) | | 12x^2-24x-18=0 | | -5-y=14 | | (a+b)x^2+(a+b)x-20(a+b)= | | (x+25)=x | | -y=-3x+6 | | 6(2x^3-4x-3)=0 | | 3x+2x+2x+4+3-9=75 | | 7x-9y=-1 | | -x^3+x^2-2x=0 | | -3(x-2)=9(x-6) | | 16v^3-25v= | | (x+25)=(x+10) | | 13x+21= |

Equations solver categories