3x-x^2=-8

Simple and best practice solution for 3x-x^2=-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 3x-x^2=-8 equation:


Simplifying
3x + -1x2 = -8

Solving
3x + -1x2 = -8

Solving for variable 'x'.

Reorder the terms:
8 + 3x + -1x2 = -8 + 8

Combine like terms: -8 + 8 = 0
8 + 3x + -1x2 = 0

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

Divide each side by '-1'.
-8 + -3x + x2 = 0

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + -3x + 8 + x2 = 0 + 8

Reorder the terms:
-8 + 8 + -3x + x2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + -3x + x2 = 0 + 8
-3x + x2 = 0 + 8

Combine like terms: 0 + 8 = 8
-3x + x2 = 8

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = 8 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 8 + 2.25

Combine like terms: 8 + 2.25 = 10.25
2.25 + -3x + x2 = 10.25

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 10.25

Calculate the square root of the right side: 3.201562119

Break this problem into two subproblems by setting 
(x + -1.5) equal to 3.201562119 and -3.201562119.

Subproblem 1

x + -1.5 = 3.201562119 Simplifying x + -1.5 = 3.201562119 Reorder the terms: -1.5 + x = 3.201562119 Solving -1.5 + x = 3.201562119 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 3.201562119 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 3.201562119 + 1.5 x = 3.201562119 + 1.5 Combine like terms: 3.201562119 + 1.5 = 4.701562119 x = 4.701562119 Simplifying x = 4.701562119

Subproblem 2

x + -1.5 = -3.201562119 Simplifying x + -1.5 = -3.201562119 Reorder the terms: -1.5 + x = -3.201562119 Solving -1.5 + x = -3.201562119 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -3.201562119 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -3.201562119 + 1.5 x = -3.201562119 + 1.5 Combine like terms: -3.201562119 + 1.5 = -1.701562119 x = -1.701562119 Simplifying x = -1.701562119

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.701562119, -1.701562119}

See similar equations:

| 6x-(-6)=12 | | (-12)(-3a)(-2)= | | r^2=sqrt(8r) | | qr+x=r | | 4n+7=-11+n | | 0.8x+2=0.6x | | 20p^2=24p | | 7t-8=28 | | .3=.02(x-3)+.05(x+3) | | -1-7(9+7a)=-9(6a-4) | | 6(a-8)+24=4(a-4) | | X-(-8)+8=32 | | 107+38k=10k+2 | | 3(2x-1+5)=6(x-1) | | -5pq+pr+6p-1=-5q-4 | | 228=163-w | | X(7+9)-4=28 | | 3x+3x+8x^2+8x^2= | | 8z+z=8z-5 | | 12(4.8x)=x | | -5(x-10)= | | 9(5x+7)-(22x-13)= | | 3y+5=2y+13 | | 1.25x+3.5=-2.75 | | 3(w-7)-5w=-25 | | s/6+21=28 | | 7i=X | | 7n-8=4+n | | 2s^2-6s-80=0 | | X-8(-8)+8=32 | | 15x+73=24 | | 3(m+5)-6=4+5(m-1) |

Equations solver categories