5x^2=8x+21

Simple and best practice solution for 5x^2=8x+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 5x^2=8x+21 equation:


Simplifying
5x2 = 8x + 21

Reorder the terms:
5x2 = 21 + 8x

Solving
5x2 = 21 + 8x

Solving for variable 'x'.

Reorder the terms:
-21 + -8x + 5x2 = 21 + 8x + -21 + -8x

Reorder the terms:
-21 + -8x + 5x2 = 21 + -21 + 8x + -8x

Combine like terms: 21 + -21 = 0
-21 + -8x + 5x2 = 0 + 8x + -8x
-21 + -8x + 5x2 = 8x + -8x

Combine like terms: 8x + -8x = 0
-21 + -8x + 5x2 = 0

Factor a trinomial.
(-7 + -5x)(3 + -1x) = 0

Subproblem 1

Set the factor '(-7 + -5x)' equal to zero and attempt to solve: Simplifying -7 + -5x = 0 Solving -7 + -5x = 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 + -5x = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -5x = 0 + 7 -5x = 0 + 7 Combine like terms: 0 + 7 = 7 -5x = 7 Divide each side by '-5'. x = -1.4 Simplifying x = -1.4

Subproblem 2

Set the factor '(3 + -1x)' equal to zero and attempt to solve: Simplifying 3 + -1x = 0 Solving 3 + -1x = 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 + -1x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -1x = 0 + -3 -1x = 0 + -3 Combine like terms: 0 + -3 = -3 -1x = -3 Divide each side by '-1'. x = 3 Simplifying x = 3

Solution

x = {-1.4, 3}

See similar equations:

| 8x-1=6x-6 | | .75b-4=12 | | 3(x-5)=29 | | -9m=-45 | | 9x--5=-6 | | 4u-5=y | | 4t+1+2t-5t=5+3 | | f(a)=9(a)-5 | | 295=-6x+7(n+6) | | 6(3x+7)-12x= | | -8-2j=-j | | 8x-x-40=10x+c | | 93=-3(4-7n) | | 5(3+6p)=-18-3p | | 25*15=x | | 3(3)-3y=9 | | -16=-32 | | 2(n+3)-7(-8n+5)=-29 | | 30-x=3+6x | | 6cm+8cm=w | | 4x=8-3x | | 15+7=4a | | f(a)=9(-3)-5 | | 6x-15=15+9x | | 2x-=-25 | | 11x-4=2x-3 | | 5w+(w*w)-(4*9)=0 | | 3*s-6+2=4*s+2-21 | | 9x--5=6 | | 14x+6x-10=90 | | -x^2+2*x=-6 | | 3(0)-3y=9 |

Equations solver categories