3x^2+x-16=0

Simple and best practice solution for 3x^2+x-16=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 3x^2+x-16=0 equation:


Simplifying
3x2 + x + -16 = 0

Reorder the terms:
-16 + x + 3x2 = 0

Solving
-16 + x + 3x2 = 0

Solving for variable 'x'.

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

Divide each side by '3'.
-5.333333333 + 0.3333333333x + x2 = 0

Move the constant term to the right:

Add '5.333333333' to each side of the equation.
-5.333333333 + 0.3333333333x + 5.333333333 + x2 = 0 + 5.333333333

Reorder the terms:
-5.333333333 + 5.333333333 + 0.3333333333x + x2 = 0 + 5.333333333

Combine like terms: -5.333333333 + 5.333333333 = 0.000000000
0.000000000 + 0.3333333333x + x2 = 0 + 5.333333333
0.3333333333x + x2 = 0 + 5.333333333

Combine like terms: 0 + 5.333333333 = 5.333333333
0.3333333333x + x2 = 5.333333333

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.
0.3333333333x + 0.25 + x2 = 5.333333333 + 0.25

Reorder the terms:
0.25 + 0.3333333333x + x2 = 5.333333333 + 0.25

Combine like terms: 5.333333333 + 0.25 = 5.583333333
0.25 + 0.3333333333x + x2 = 5.583333333

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 5.583333333

Calculate the square root of the right side: 2.362907813

Break this problem into two subproblems by setting 
(x + 0.5) equal to 2.362907813 and -2.362907813.

Subproblem 1

x + 0.5 = 2.362907813 Simplifying x + 0.5 = 2.362907813 Reorder the terms: 0.5 + x = 2.362907813 Solving 0.5 + x = 2.362907813 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 = 2.362907813 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 2.362907813 + -0.5 x = 2.362907813 + -0.5 Combine like terms: 2.362907813 + -0.5 = 1.862907813 x = 1.862907813 Simplifying x = 1.862907813

Subproblem 2

x + 0.5 = -2.362907813 Simplifying x + 0.5 = -2.362907813 Reorder the terms: 0.5 + x = -2.362907813 Solving 0.5 + x = -2.362907813 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 = -2.362907813 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -2.362907813 + -0.5 x = -2.362907813 + -0.5 Combine like terms: -2.362907813 + -0.5 = -2.862907813 x = -2.862907813 Simplifying x = -2.862907813

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.862907813, -2.862907813}

See similar equations:

| 7x+60=5x+120 | | -7=3+v | | -3x-3x=20-2 | | 4x-3x+16=8 | | 4y+8x=1 | | -21=-7/4y | | -12=-2+f | | 1(2340)=0432 | | 5*-2+1+3*-2=15 | | 3y+9=2x | | -3/7x=15 | | 45-n=10 | | (x^2+2x-8)/(5x-10) | | 7w/6=-49 | | x+y=2z-4 | | 8=2c | | x=90+-5x | | 35-n=10 | | 23/8+95/8 | | 3x-6+2x+3=-14 | | -3.65=a+1.31 | | (5x-15)+6=7x+9 | | -3.65=a+1.37 | | 3=-6a-1 | | 7(t+8)-5(-6t-4)=36(t+3)-8 | | 2(2x-2)=4 | | 5n-5=15 | | 5(x-2)=100 | | x/4+9=23 | | 3x-2=-7x+8 | | 9x^2+72x+135=0 | | 10x-2y=1 |

Equations solver categories