4x^2=21x-20

Simple and best practice solution for 4x^2=21x-20 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 4x^2=21x-20 equation:


Simplifying
4x2 = 21x + -20

Reorder the terms:
4x2 = -20 + 21x

Solving
4x2 = -20 + 21x

Solving for variable 'x'.

Reorder the terms:
20 + -21x + 4x2 = -20 + 21x + 20 + -21x

Reorder the terms:
20 + -21x + 4x2 = -20 + 20 + 21x + -21x

Combine like terms: -20 + 20 = 0
20 + -21x + 4x2 = 0 + 21x + -21x
20 + -21x + 4x2 = 21x + -21x

Combine like terms: 21x + -21x = 0
20 + -21x + 4x2 = 0

Factor a trinomial.
(5 + -4x)(4 + -1x) = 0

Subproblem 1

Set the factor '(5 + -4x)' equal to zero and attempt to solve: Simplifying 5 + -4x = 0 Solving 5 + -4x = 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 + -4x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -4x = 0 + -5 -4x = 0 + -5 Combine like terms: 0 + -5 = -5 -4x = -5 Divide each side by '-4'. x = 1.25 Simplifying x = 1.25

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 = {1.25, 4}

See similar equations:

| 5(7x-1)=205 | | 3.6=9x | | 28=8*16+12-7*16 | | 15x+5=15x-5 | | -4(2n-5)=3n+10 | | 10x+7=8-2x | | 3x+21=5x+3 | | 8-10s+10s+10+2s= | | 23x=720 | | 5.5x=540 | | x/2-1/4=x/3+3/4 | | 14-(2a+5)=-2a+9 | | 2x+10x-(4x+9)= | | 9x+1=9(x-4) | | 7c-3c=1 | | 9x-1-7x=5x+8 | | 25000(0.58)+13000=27500(1) | | -11(2x+4)2=7x-2(2) | | (2x+39)=(x+64) | | 9x+10-8x=16 | | -9x^2=45x | | 12x^2+25-2=-14 | | 4-2a=20 | | 22r^5=0 | | (x-10)(x-10)=12 | | 15/m=1/7/1/3 | | 3x+2(x+4)=7 | | x^2+12x+36=-12 | | 6(x-3)+6=6(x-3)+6 | | 32.3x+46.6-33.5x-31.2= | | .10x=10000 | | 2x+4y-12=0 |

Equations solver categories