(y^2)+4y-21=0

Simple and best practice solution for (y^2)+4y-21=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 (y^2)+4y-21=0 equation:


Simplifying
(y2) + 4y + -21 = 0
y2 + 4y + -21 = 0

Reorder the terms:
-21 + 4y + y2 = 0

Solving
-21 + 4y + y2 = 0

Solving for variable 'y'.

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:

| x+x(1-x)=0.875 | | 10000000+2000000+300000= | | 348=y | | 7x/24-6=x/6+9 | | 1(1+y)=5-3y^2 | | y=3/4x-5 | | 7y+5=6y-3 | | 1/5(a+3)=1/2(4-a) | | 4b^2=1 | | 815+x+2x=900 | | x^2-8x=x(2+x) | | 5n^2-125=0 | | 5n^2-125=0 | | (x+5/7)^2=11/49 | | (v/-3w^4)^3 | | (7y+9)(y+7)=47 | | 9v^2=-4+8v | | 3t^2-60=0 | | X(2x+12)=18 | | 2xdy-3y^2dx=0 | | 21x^2-10x+1=0 | | 6g+13=-13 | | 2t^2-250=0 | | a^5=a^3 | | 180/2.25 | | 15x^2-40x+25=0 | | y-6=5(x+2) | | x+16=103 | | x^3-1x=12x^2-12 | | m^2-m=2 | | 2x+y=640 | | 8x-5x+2x= |

Equations solver categories