4x^2+6x-121=0

Simple and best practice solution for 4x^2+6x-121=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 4x^2+6x-121=0 equation:


Simplifying
4x2 + 6x + -121 = 0

Reorder the terms:
-121 + 6x + 4x2 = 0

Solving
-121 + 6x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
-30.25 + 1.5x + x2 = 0

Move the constant term to the right:

Add '30.25' to each side of the equation.
-30.25 + 1.5x + 30.25 + x2 = 0 + 30.25

Reorder the terms:
-30.25 + 30.25 + 1.5x + x2 = 0 + 30.25

Combine like terms: -30.25 + 30.25 = 0.00
0.00 + 1.5x + x2 = 0 + 30.25
1.5x + x2 = 0 + 30.25

Combine like terms: 0 + 30.25 = 30.25
1.5x + x2 = 30.25

The x term is 1.5x.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5x + 0.5625 + x2 = 30.25 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = 30.25 + 0.5625

Combine like terms: 30.25 + 0.5625 = 30.8125
0.5625 + 1.5x + x2 = 30.8125

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 30.8125

Calculate the square root of the right side: 5.550900828

Break this problem into two subproblems by setting 
(x + 0.75) equal to 5.550900828 and -5.550900828.

Subproblem 1

x + 0.75 = 5.550900828 Simplifying x + 0.75 = 5.550900828 Reorder the terms: 0.75 + x = 5.550900828 Solving 0.75 + x = 5.550900828 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = 5.550900828 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 5.550900828 + -0.75 x = 5.550900828 + -0.75 Combine like terms: 5.550900828 + -0.75 = 4.800900828 x = 4.800900828 Simplifying x = 4.800900828

Subproblem 2

x + 0.75 = -5.550900828 Simplifying x + 0.75 = -5.550900828 Reorder the terms: 0.75 + x = -5.550900828 Solving 0.75 + x = -5.550900828 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = -5.550900828 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -5.550900828 + -0.75 x = -5.550900828 + -0.75 Combine like terms: -5.550900828 + -0.75 = -6.300900828 x = -6.300900828 Simplifying x = -6.300900828

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.800900828, -6.300900828}

See similar equations:

| y=9/5x-5 | | 35x+50=46-6x | | -7(x-4)=-11(x-10) | | (1/8)8 | | x-x/5 | | 3(w-4)=9 | | 2x-6+10x=5(4x-3)+5 | | 3x/ln5 | | 8y-3=2y+5 | | u/9=2 | | (5/6)*h-9=251/36 | | 11w=6490 | | 17.50+3.50x=125+3.50x | | X^2+8=29 | | (4b-3)(5b+4)=0 | | 93-5x^2=13 | | (3h/4)-20=5(5/16) | | t+14=30 | | 4x/x-1=7 | | 9-7=7 | | 2y+5y-3-y=4y-y+9+3y | | X^2+23=27 | | 5h/6-9=8[35/36] | | Cosx+cos^3x=0 | | 5h/6-9=8[35/36 | | 9x-(2x-6)=8-x | | a/d-9 | | w/-2=12 | | 25=q+2 | | y/5.12=2 | | 10r^3=90r | | s=-10t+45 |

Equations solver categories