x(3x+2)=21

Simple and best practice solution for x(3x+2)=21 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 x(3x+2)=21 equation:


Simplifying
x(3x + 2) = 21

Reorder the terms:
x(2 + 3x) = 21
(2 * x + 3x * x) = 21
(2x + 3x2) = 21

Solving
2x + 3x2 = 21

Solving for variable 'x'.

Reorder the terms:
-21 + 2x + 3x2 = 21 + -21

Combine like terms: 21 + -21 = 0
-21 + 2x + 3x2 = 0

Factor a trinomial.
(-3 + -1x)(7 + -3x) = 0

Subproblem 1

Set the factor '(-3 + -1x)' equal to zero and attempt to solve: Simplifying -3 + -1x = 0 Solving -3 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + -1x = 0 + 3 Combine like terms: -3 + 3 = 0 0 + -1x = 0 + 3 -1x = 0 + 3 Combine like terms: 0 + 3 = 3 -1x = 3 Divide each side by '-1'. x = -3 Simplifying x = -3

Subproblem 2

Set the factor '(7 + -3x)' equal to zero and attempt to solve: Simplifying 7 + -3x = 0 Solving 7 + -3x = 0 Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -3x = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -3x = 0 + -7 -3x = 0 + -7 Combine like terms: 0 + -7 = -7 -3x = -7 Divide each side by '-3'. x = 2.333333333 Simplifying x = 2.333333333

Solution

x = {-3, 2.333333333}

See similar equations:

| 2.5+3.1=3.1 | | 3x+3(4x-5)=75 | | f(x)=2x^2-12x+20 | | 3y=135 | | x+.18(351)=.15(x+351) | | 2x^2+11xy-6y^2=0 | | 2x^2+11xy-6x^2=0 | | -17x+12=-45 | | 4x+3(x-13)=17 | | 152-(7x+14)=7(x+9)+x | | 2x(x+7)=500 | | x+(x-18)=56 | | 0.6*q= | | 7x+4(2x-10)=125 | | 8x+40+6x+7y+3y-10=180 | | 24x-9-14x+3=24x-4-14x+13 | | 4.8x-.36x^2=0 | | -(9-3x)-(4+2x)=-(2-5x)-x | | -3x+17=4 | | 110x=73(x+1.5) | | x+5x=-36 | | (182-4x)+(5x+2)=4y+2 | | -17x-20=-14+85 | | y=250+1.5(107)+80(2.8) | | 7x+19=3x+1 | | 8c=128 | | x(3x+4)=175 | | 5y+20=4y+35 | | 6x+13-9x=19-15x+12x-6 | | -1-6x=4+4x | | 2x^2+x-612=0 | | .5y=8+.5y |

Equations solver categories