8x^2-2x=21

Simple and best practice solution for 8x^2-2x=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 8x^2-2x=21 equation:


Simplifying
8x2 + -2x = 21

Reorder the terms:
-2x + 8x2 = 21

Solving
-2x + 8x2 = 21

Solving for variable 'x'.

Reorder the terms:
-21 + -2x + 8x2 = 21 + -21

Combine like terms: 21 + -21 = 0
-21 + -2x + 8x2 = 0

Factor a trinomial.
(-3 + -2x)(7 + -4x) = 0

Subproblem 1

Set the factor '(-3 + -2x)' equal to zero and attempt to solve: Simplifying -3 + -2x = 0 Solving -3 + -2x = 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 + -2x = 0 + 3 Combine like terms: -3 + 3 = 0 0 + -2x = 0 + 3 -2x = 0 + 3 Combine like terms: 0 + 3 = 3 -2x = 3 Divide each side by '-2'. x = -1.5 Simplifying x = -1.5

Subproblem 2

Set the factor '(7 + -4x)' equal to zero and attempt to solve: Simplifying 7 + -4x = 0 Solving 7 + -4x = 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 + -4x = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -4x = 0 + -7 -4x = 0 + -7 Combine like terms: 0 + -7 = -7 -4x = -7 Divide each side by '-4'. x = 1.75 Simplifying x = 1.75

Solution

x = {-1.5, 1.75}

See similar equations:

| y/5=-9 | | 4a^2-9=35 | | 3m=-84 | | -7x+14=-22-5(x+20) | | 3x-2/8+2-x/4=-1/2 | | (x-5)(x^2-6x+7)=0 | | 10x+4=-12-6x | | 6+1/3(x-9)=1/2(2-x) | | 8(x-2)=4(2x-3)-4 | | 1.5(2x-4)=8 | | 9-11x=x-15 | | -10(x+3)=60 | | (2x-4)=8 | | 2.3q-4.8-2.2q=-0.9q-3.1 | | x=24+8x-3(x+4) | | -23+y=y+25 | | 8x+2+4x+9=11x+3 | | 12720+20x=0 | | 9=4y-1 | | 7c^2=91 | | N^2=83 | | 235+0.75x=125+1.63 | | 20a*2-13a-21=0 | | 5x(x-1)+7=4x(x-2) | | 9-4x-7x=141 | | 9=4y+1 | | -88=-6x-7x+3 | | 16n^2-114n=14 | | 5(2+3w)-2(5-7w)=58 | | 5w^2-13w+6=0 | | 5z^2-29z-42=0 | | 4s+5s+3=6s+5+10 |

Equations solver categories