9x^2+66x+21=0

Simple and best practice solution for 9x^2+66x+21=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 9x^2+66x+21=0 equation:


Simplifying
9x2 + 66x + 21 = 0

Reorder the terms:
21 + 66x + 9x2 = 0

Solving
21 + 66x + 9x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '3'.
3(7 + 22x + 3x2) = 0

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

Ignore the factor 3.

Subproblem 1

Set the factor '(7 + x)' equal to zero and attempt to solve: Simplifying 7 + x = 0 Solving 7 + x = 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 + x = 0 + -7 Combine like terms: 7 + -7 = 0 0 + x = 0 + -7 x = 0 + -7 Combine like terms: 0 + -7 = -7 x = -7 Simplifying x = -7

Subproblem 2

Set the factor '(1 + 3x)' equal to zero and attempt to solve: Simplifying 1 + 3x = 0 Solving 1 + 3x = 0 Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 3x = 0 + -1 Combine like terms: 1 + -1 = 0 0 + 3x = 0 + -1 3x = 0 + -1 Combine like terms: 0 + -1 = -1 3x = -1 Divide each side by '3'. x = -0.3333333333 Simplifying x = -0.3333333333

Solution

x = {-7, -0.3333333333}

See similar equations:

| 4d+9=17 | | 40k+80=30k+90 | | 2+10x+5x-6=116 | | 4f-7=25 | | 9x^2+66x+21=9 | | .25k-.25=7 | | 301+240=501-160 | | -5-7x=16 | | 234=94-x | | 7x^2+53x+28=0 | | 0.60x+.05(10-x)=.10(-72) | | Y=.25x+.5 | | x(y+z)=w | | 14+x=-5 | | -12=2+5v | | 4+30+4.50= | | .42857143y=0 | | Y=.375x-.75 | | -3+2x-8-4x=1-4x | | 7(x-3)=5x-3 | | 10+7x=-67 | | 55-4x=15 | | 175a=76 | | 45*36u=66+23u+31 | | 40=(6y-2) | | -10+2x=-4 | | ln(x-1)-ln(x+1)=ln(x-4)-ln(x+2) | | -2w=19 | | 25x-3(2x-7)-4x=-9 | | 19-5t=t+1 | | 2(x+1)-3x=3(3*2x) | | -.875x=.875 |

Equations solver categories