3x^2-7x-100=0

Simple and best practice solution for 3x^2-7x-100=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^2-7x-100=0 equation:


Simplifying
3x2 + -7x + -100 = 0

Reorder the terms:
-100 + -7x + 3x2 = 0

Solving
-100 + -7x + 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'.
-33.33333333 + -2.333333333x + x2 = 0

Move the constant term to the right:

Add '33.33333333' to each side of the equation.
-33.33333333 + -2.333333333x + 33.33333333 + x2 = 0 + 33.33333333

Reorder the terms:
-33.33333333 + 33.33333333 + -2.333333333x + x2 = 0 + 33.33333333

Combine like terms: -33.33333333 + 33.33333333 = 0.00000000
0.00000000 + -2.333333333x + x2 = 0 + 33.33333333
-2.333333333x + x2 = 0 + 33.33333333

Combine like terms: 0 + 33.33333333 = 33.33333333
-2.333333333x + x2 = 33.33333333

The x term is -2.333333333x.  Take half its coefficient (-1.166666667).
Square it (1.361111112) and add it to both sides.

Add '1.361111112' to each side of the equation.
-2.333333333x + 1.361111112 + x2 = 33.33333333 + 1.361111112

Reorder the terms:
1.361111112 + -2.333333333x + x2 = 33.33333333 + 1.361111112

Combine like terms: 33.33333333 + 1.361111112 = 34.694444442
1.361111112 + -2.333333333x + x2 = 34.694444442

Factor a perfect square on the left side:
(x + -1.166666667)(x + -1.166666667) = 34.694444442

Calculate the square root of the right side: 5.890199015

Break this problem into two subproblems by setting 
(x + -1.166666667) equal to 5.890199015 and -5.890199015.

Subproblem 1

x + -1.166666667 = 5.890199015 Simplifying x + -1.166666667 = 5.890199015 Reorder the terms: -1.166666667 + x = 5.890199015 Solving -1.166666667 + x = 5.890199015 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.166666667' to each side of the equation. -1.166666667 + 1.166666667 + x = 5.890199015 + 1.166666667 Combine like terms: -1.166666667 + 1.166666667 = 0.000000000 0.000000000 + x = 5.890199015 + 1.166666667 x = 5.890199015 + 1.166666667 Combine like terms: 5.890199015 + 1.166666667 = 7.056865682 x = 7.056865682 Simplifying x = 7.056865682

Subproblem 2

x + -1.166666667 = -5.890199015 Simplifying x + -1.166666667 = -5.890199015 Reorder the terms: -1.166666667 + x = -5.890199015 Solving -1.166666667 + x = -5.890199015 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.166666667' to each side of the equation. -1.166666667 + 1.166666667 + x = -5.890199015 + 1.166666667 Combine like terms: -1.166666667 + 1.166666667 = 0.000000000 0.000000000 + x = -5.890199015 + 1.166666667 x = -5.890199015 + 1.166666667 Combine like terms: -5.890199015 + 1.166666667 = -4.723532348 x = -4.723532348 Simplifying x = -4.723532348

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.056865682, -4.723532348}

See similar equations:

| Ix-1I=2 | | 5x^4-26x^3+26x-5=0 | | x-8y-z=0 | | y=f(x+5)+6 | | 5.5x+6-3.5x=10 | | 5/6(x-2/3)=6.5 | | -2.7x=33.21 | | -27x=33.21 | | 16x^2-12x-375=0 | | xsquared-2x=146 | | 3(2y-1)=27 | | 12x=-29+89 | | b^2+8b=9 | | y=-3+18 | | 21m-12=100 | | -7(n+4)+30=-4n-4 | | 6x^2+8xy=250 | | (X+2)-x^2-40=0 | | gx^2+8xh=250 | | 39=7x+12+2x | | 4-7x=13-3x | | 12x=29+89 | | 3x+yoverc=4 | | 45=x(-9) | | 5(x+6)-9=3(6)-6+2x | | 6x-7x-10=0 | | 6xsquared-7x-10=0 | | P-31=-39 | | 4x+4y+3z-2x+2z-5y= | | -24=n^2-n-30 | | 0.05(x-8)=0.07x | | P-31=-31 |

Equations solver categories