3x^2+5x-86=0

Simple and best practice solution for 3x^2+5x-86=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+5x-86=0 equation:


Simplifying
3x2 + 5x + -86 = 0

Reorder the terms:
-86 + 5x + 3x2 = 0

Solving
-86 + 5x + 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'.
-28.66666667 + 1.666666667x + x2 = 0

Move the constant term to the right:

Add '28.66666667' to each side of the equation.
-28.66666667 + 1.666666667x + 28.66666667 + x2 = 0 + 28.66666667

Reorder the terms:
-28.66666667 + 28.66666667 + 1.666666667x + x2 = 0 + 28.66666667

Combine like terms: -28.66666667 + 28.66666667 = 0.00000000
0.00000000 + 1.666666667x + x2 = 0 + 28.66666667
1.666666667x + x2 = 0 + 28.66666667

Combine like terms: 0 + 28.66666667 = 28.66666667
1.666666667x + x2 = 28.66666667

The x term is 1.666666667x.  Take half its coefficient (0.8333333335).
Square it (0.6944444447) and add it to both sides.

Add '0.6944444447' to each side of the equation.
1.666666667x + 0.6944444447 + x2 = 28.66666667 + 0.6944444447

Reorder the terms:
0.6944444447 + 1.666666667x + x2 = 28.66666667 + 0.6944444447

Combine like terms: 28.66666667 + 0.6944444447 = 29.3611111147
0.6944444447 + 1.666666667x + x2 = 29.3611111147

Factor a perfect square on the left side:
(x + 0.8333333335)(x + 0.8333333335) = 29.3611111147

Calculate the square root of the right side: 5.418589403

Break this problem into two subproblems by setting 
(x + 0.8333333335) equal to 5.418589403 and -5.418589403.

Subproblem 1

x + 0.8333333335 = 5.418589403 Simplifying x + 0.8333333335 = 5.418589403 Reorder the terms: 0.8333333335 + x = 5.418589403 Solving 0.8333333335 + x = 5.418589403 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8333333335' to each side of the equation. 0.8333333335 + -0.8333333335 + x = 5.418589403 + -0.8333333335 Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000 0.0000000000 + x = 5.418589403 + -0.8333333335 x = 5.418589403 + -0.8333333335 Combine like terms: 5.418589403 + -0.8333333335 = 4.5852560695 x = 4.5852560695 Simplifying x = 4.5852560695

Subproblem 2

x + 0.8333333335 = -5.418589403 Simplifying x + 0.8333333335 = -5.418589403 Reorder the terms: 0.8333333335 + x = -5.418589403 Solving 0.8333333335 + x = -5.418589403 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8333333335' to each side of the equation. 0.8333333335 + -0.8333333335 + x = -5.418589403 + -0.8333333335 Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000 0.0000000000 + x = -5.418589403 + -0.8333333335 x = -5.418589403 + -0.8333333335 Combine like terms: -5.418589403 + -0.8333333335 = -6.2519227365 x = -6.2519227365 Simplifying x = -6.2519227365

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.5852560695, -6.2519227365}

See similar equations:

| 3x^2+5x+86=0 | | (-4-x)(1-x)(3-x)=0 | | 7x+3y=11z | | 12+a+8+3a-3=49 | | 5x-748=938x+84 | | (-9-x)(-4-x)+6=0 | | 1/4(10x-7)=3 | | x^3-4x^2-25x-66=0 | | 5x^2-11x-19=0 | | 2(6+7x)=138 | | 8i-5j=x(3i+5j)+y(-5i-j) | | 2*(-1/2) | | 7x^2-37x+36=0 | | -5(2-3x)=-160 | | -5(2-3x)=160 | | 4(-3+7x)=-180 | | 2(-2x+5)=54 | | 9x+6-10x=60 | | 9x-10x= | | 36x^2+30x+25=0 | | -5(-2-6x)=280 | | -4*(1/3) | | -4*1/3 | | -2+6x=-x+61 | | 4b^2-81t^2= | | -4q^2-20q+315=0 | | -6x+10=-34+5x | | -0.33x^2-5.94x=26.4 | | -4-4x=x-44 | | 0.33x^2-5.94x=26.4 | | 10(z-2)=-4(2+1) | | 10(z-2)=-4 |

Equations solver categories