y^2+4y=21

Simple and best practice solution for y^2+4y=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 y^2+4y=21 equation:


Simplifying
y2 + 4y = 21

Reorder the terms:
4y + y2 = 21

Solving
4y + y2 = 21

Solving for variable 'y'.

Reorder the terms:
-21 + 4y + y2 = 21 + -21

Combine like terms: 21 + -21 = 0
-21 + 4y + y2 = 0

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

Subproblem 1

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

Subproblem 2

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

Solution

y = {-7, 3}

See similar equations:

| 900.00(0.02+3)= | | 42=x^2-x | | 7x+5-6x=12 | | 5/7=k/42 | | -6(w-8)-(9+8w)=-15w | | 5y-3(y-1)= | | -3y-10=5x+14 | | 6/3=y/6 | | 1100=1220-20p | | 9x-17=100 | | 48/k=8/5 | | -4+10=16x-2-15x | | 6(x-3)=9+5x | | 4pq+q= | | 2/7a=7 | | 2-y=19 | | 8-2(4-3m)= | | 24+x-6=50+6 | | 7(y+2)+y=4(y+2)+7 | | 8y=3y+18 | | d^2+5/2d+3/2=0 | | 6x+6-2x=1+3x-1 | | 6y=4x | | 28ab-7a-8b+2= | | -250.00+75.00w=500.00 | | 9-5x=3x-46 | | x^1/3=0 | | 5/6x=-10 | | (4x-2)=90 | | x^4-3-x^3+125=0 | | 5z=12-22 | | 4x^2-1-x(2x+1)=0 |

Equations solver categories