2x*x-21x+40=0

Simple and best practice solution for 2x*x-21x+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 2x*x-21x+40=0 equation: 


Simplifying
2x * x + -21x + 40 = 0

Multiply x * x
2x2 + -21x + 40 = 0

Reorder the terms:
40 + -21x + 2x2 = 0

Solving
40 + -21x + 2x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(5 + -2x)(8 + -1x) = 0


Subproblem 1
Set the factor '(5 + -2x)' equal to zero and attempt to solve:

Simplifying
5 + -2x = 0

Solving
5 + -2x = 0

Move all terms containing x to the left, all other terms to the right.

Add '-5' to each side of the equation.
5 + -5 + -2x = 0 + -5

Combine like terms: 5 + -5 = 0
0 + -2x = 0 + -5
-2x = 0 + -5

Combine like terms: 0 + -5 = -5
-2x = -5

Divide each side by '-2'.
x = 2.5

Simplifying
x = 2.5

Subproblem 2
Set the factor '(8 + -1x)' equal to zero and attempt to solve:

Simplifying
8 + -1x = 0

Solving
8 + -1x = 0

Move all terms containing x to the left, all other terms to the right.

Add '-8' to each side of the equation.
8 + -8 + -1x = 0 + -8

Combine like terms: 8 + -8 = 0
0 + -1x = 0 + -8
-1x = 0 + -8

Combine like terms: 0 + -8 = -8
-1x = -8

Divide each side by '-1'.
x = 8

Simplifying
x = 8
Solution
x = {2.5, 8}

See similar equations:

| -2+10=15x-4-14x | | 3x*x+17x+20=0 | | P/-6=-3 | | 3/1-i | | x^2+26=23 | | -3x-11x=-84 | | 1/3x=7-2/3X | | x*x-1x-56=0 | | -4/7h=-28 | | R/-5=15 | | 5-4y+y-1=-21 | | -8x=-232 | | 6x*x-41x-7=0 | | (x+50)+2x=90 | | X-24=30 | | 24=2+-11x | | M/-15=7 | | 2x^5-14x^3+24x=0 | | 8/11*(n-10)=64 | | -14x-44=32 | | 0.625x+0.0625x=0.3125+x | | T/24=-5 | | x(x^2-25)-3(x^2-25)=x | | x/3+4 | | N/1=31 | | (-2x)=4 | | -3k-8+7k=34+9k-2 | | -4x-x=27 | | x-10=-22sovle | | z=3x+7y | | -3j=-12 | | 2y+8.6-0.3=7.1 |

Equations solver categories