4x+21=x^2

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


Simplifying
4x + 21 = x2

Reorder the terms:
21 + 4x = x2

Solving
21 + 4x = x2

Solving for variable 'x'.

Combine like terms: x2 + -1x2 = 0
21 + 4x + -1x2 = 0

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

Subproblem 1

Set the factor '(7 + -1x)' equal to zero and attempt to solve: Simplifying 7 + -1x = 0 Solving 7 + -1x = 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 + -1x = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -1x = 0 + -7 -1x = 0 + -7 Combine like terms: 0 + -7 = -7 -1x = -7 Divide each side by '-1'. x = 7 Simplifying x = 7

Subproblem 2

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

Solution

x = {7, -3}

See similar equations:

| L=0.6log(2+5T) | | 13=-3x-5 | | x^4+4x^3+x^2-6x=0 | | 4a-b=0 | | 8x-20=4y+6 | | -2v-5v-17=25 | | 21=3x-39 | | 10.00x^2=8.605 | | 7.00x=8.605 | | 5x^2+15x+10=0 | | -2x+25=37 | | -7u+-5u+20u-7=-1 | | -3+5x=21 | | p^2-200p+18300=0 | | 5R=11 | | -13=5(1+4m)-m | | 2b-3=-5 | | 3x-xy-1=0 | | 4x*4x+5y*4x+4x*5y+5y*5y=0 | | 9x+3x-6x= | | 12.2*a=40.325 | | 26+y=-16 | | 32x^2+128x-1=0 | | 6x^2(4)+x^2-12=0 | | (3x^2+4x)+(2x^2+9x-1)= | | 10x^5+25x+100x^3=0 | | (3x-4)+(x+6)=5x-1 | | log(4x+6)=1+log(x-8) | | 4.3x-20=2.1x+2 | | n=(k^3+3k^2-k)*(k^3+3k^2+k) | | (x^7)=52 | | (5m^2)+2m=4 |

Equations solver categories