3x^2+9x=84

Simple and best practice solution for 3x^2+9x=84 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+9x=84 equation:


Simplifying
3x2 + 9x = 84

Reorder the terms:
9x + 3x2 = 84

Solving
9x + 3x2 = 84

Solving for variable 'x'.

Reorder the terms:
-84 + 9x + 3x2 = 84 + -84

Combine like terms: 84 + -84 = 0
-84 + 9x + 3x2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(-28 + 3x + x2) = 0

Factor a trinomial.
3((-7 + -1x)(4 + -1x)) = 0

Ignore the factor 3.

Subproblem 1

Set the factor '(-7 + -1x)' equal to zero and attempt to solve: Simplifying -7 + -1x = 0 Solving -7 + -1x = 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 + -1x = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -1x = 0 + 7 -1x = 0 + 7 Combine like terms: 0 + 7 = 7 -1x = 7 Divide each side by '-1'. x = -7 Simplifying x = -7

Subproblem 2

Set the factor '(4 + -1x)' equal to zero and attempt to solve: Simplifying 4 + -1x = 0 Solving 4 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -1x = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -1x = 0 + -4 -1x = 0 + -4 Combine like terms: 0 + -4 = -4 -1x = -4 Divide each side by '-1'. x = 4 Simplifying x = 4

Solution

x = {-7, 4}

See similar equations:

| 3n-6=5n+20 | | 4x+5=2(2x+1) | | 6x+10+2x-8=90 | | x^2-12x-5=8 | | x+4+7x-10=90 | | 3x-.5=1.5 | | 3x+17=13x-103 | | 3x-2x+5=2x+10 | | x+10+8x-10=90 | | 3(2x+1)=6x | | y+4+6y-5=90 | | 7p+5q=64 | | 117-7x=38x+17 | | 7q+5q=64 | | 12-7x=92-21x | | 5x+2+2x-10=90 | | 4t+3t=21 | | 4x-4+2x=14 | | 9x+17=3x+107 | | 5m+4m=-27 | | x^2-8x+24=0 | | 74-7x=38x+19 | | y-7=-4(x+1) | | z+9+8z-9=90 | | 10-7x=58-28x | | 8x-23=49 | | z+9=8z-9 | | -117-7x=8x+18 | | 2-4x+12=-90+9x | | 9x^5-12x= | | 12=-3x+6 | | 2w+3=3w-4 |

Equations solver categories