5d^2-20d=105

Simple and best practice solution for 5d^2-20d=105 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 5d^2-20d=105 equation:


Simplifying
5d2 + -20d = 105

Reorder the terms:
-20d + 5d2 = 105

Solving
-20d + 5d2 = 105

Solving for variable 'd'.

Reorder the terms:
-105 + -20d + 5d2 = 105 + -105

Combine like terms: 105 + -105 = 0
-105 + -20d + 5d2 = 0

Factor out the Greatest Common Factor (GCF), '5'.
5(-21 + -4d + d2) = 0

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

Ignore the factor 5.

Subproblem 1

Set the factor '(-3 + -1d)' equal to zero and attempt to solve: Simplifying -3 + -1d = 0 Solving -3 + -1d = 0 Move all terms containing d to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + -1d = 0 + 3 Combine like terms: -3 + 3 = 0 0 + -1d = 0 + 3 -1d = 0 + 3 Combine like terms: 0 + 3 = 3 -1d = 3 Divide each side by '-1'. d = -3 Simplifying d = -3

Subproblem 2

Set the factor '(7 + -1d)' equal to zero and attempt to solve: Simplifying 7 + -1d = 0 Solving 7 + -1d = 0 Move all terms containing d to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -1d = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -1d = 0 + -7 -1d = 0 + -7 Combine like terms: 0 + -7 = -7 -1d = -7 Divide each side by '-1'. d = 7 Simplifying d = 7

Solution

d = {-3, 7}

See similar equations:

| [x-6]=-25 | | [x-6]=25 | | -156=12(x+1) | | -5(x+1)-x-6=-6(x+3)+7 | | 0.4x-0.2=0.5-0.6(9-2x) | | 6r^2+20=-34r | | y+47/8=2 | | 15+2x+3y=0 | | 9y^2+54y-243=0 | | 0.33x-0.4(x+1)=0.66 | | 16x+4(-4x+8)=7 | | (3x-4)=31 | | -2(x-4)=16 | | 3(2x+1)+3=-39 | | 56p^2=8p | | 3.8x=4 | | [x]=19 | | x+(y+12)=32 | | 5(2x-4)=-10 | | -5k+3(-6+8k)=30-5k | | 4x^2+88x-300=0 | | -5x-3/8x-5/2=19 | | -28=d | | x+(x+2)(x+4)(x+6)=84 | | 12x=7-10y | | 51/4=w+21/2 | | 7m-2=m(4+m) | | 21L=112 | | x+8=-x+6-2x | | (x-3)+(x+17)=90 | | -5g-13=54 | | -2(3x+24)=36 |

Equations solver categories