3x^2+12x-40=0

Simple and best practice solution for 3x^2+12x-40=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+12x-40=0 equation:


Simplifying
3x2 + 12x + -40 = 0

Reorder the terms:
-40 + 12x + 3x2 = 0

Solving
-40 + 12x + 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'.
-13.33333333 + 4x + x2 = 0

Move the constant term to the right:

Add '13.33333333' to each side of the equation.
-13.33333333 + 4x + 13.33333333 + x2 = 0 + 13.33333333

Reorder the terms:
-13.33333333 + 13.33333333 + 4x + x2 = 0 + 13.33333333

Combine like terms: -13.33333333 + 13.33333333 = 0.00000000
0.00000000 + 4x + x2 = 0 + 13.33333333
4x + x2 = 0 + 13.33333333

Combine like terms: 0 + 13.33333333 = 13.33333333
4x + x2 = 13.33333333

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = 13.33333333 + 4

Reorder the terms:
4 + 4x + x2 = 13.33333333 + 4

Combine like terms: 13.33333333 + 4 = 17.33333333
4 + 4x + x2 = 17.33333333

Factor a perfect square on the left side:
(x + 2)(x + 2) = 17.33333333

Calculate the square root of the right side: 4.163331999

Break this problem into two subproblems by setting 
(x + 2) equal to 4.163331999 and -4.163331999.

Subproblem 1

x + 2 = 4.163331999 Simplifying x + 2 = 4.163331999 Reorder the terms: 2 + x = 4.163331999 Solving 2 + x = 4.163331999 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 4.163331999 + -2 Combine like terms: 2 + -2 = 0 0 + x = 4.163331999 + -2 x = 4.163331999 + -2 Combine like terms: 4.163331999 + -2 = 2.163331999 x = 2.163331999 Simplifying x = 2.163331999

Subproblem 2

x + 2 = -4.163331999 Simplifying x + 2 = -4.163331999 Reorder the terms: 2 + x = -4.163331999 Solving 2 + x = -4.163331999 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -4.163331999 + -2 Combine like terms: 2 + -2 = 0 0 + x = -4.163331999 + -2 x = -4.163331999 + -2 Combine like terms: -4.163331999 + -2 = -6.163331999 x = -6.163331999 Simplifying x = -6.163331999

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.163331999, -6.163331999}

See similar equations:

| 567z-36(5688z-56)-455677=3455-4667z/34456 | | 567z-36(5688z-56)-455677=3455-4667z | | 5x^2-2-14x^2+9+8x= | | 4p+7=-2p-5 | | 6(x+4)=(6x+24) | | 10x^2+5-6x-9x^2-11x= | | x^2+4x+4-x^2=20 | | -3(5v-x)-(4x-2v)= | | 2(x+7)(x-3)-x(x+7)=90 | | 2(5k-6)-4k=3k-39 | | 2xw-5x-xw+2x= | | 2L(W-3)=W^2+7W+90 | | -2(-5v-3)-v= | | 5(x-1)-3(x^2+3x+4)-8(x+8)= | | -(-v+x)+5(-4x-5v)= | | -(-v+5)+5(-4x-5v)= | | 8x+54=3x-1 | | -3(5v-x)+4(-6x+3v)= | | x^3-20x+96=0 | | 2wu-w-wu-w= | | 12e-14=0 | | -2(6v-3)-v= | | 2d+5=15 | | X^2-10x+20=0 | | x(x+2)6=144 | | -(-v+x)+6(-5x+6v)= | | (t-4)(t-4)=0 | | s^2=25 | | 12n=11n+22 | | T=3M-2 | | 4x-1=14x-121 | | 4x+23=12x-41 |

Equations solver categories