x*(x+2)*4=21

Simple and best practice solution for x*(x+2)*4=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 x*(x+2)*4=21 equation: 


Simplifying
x(x + 2) * 4 = 21

Reorder the terms:
x(2 + x) * 4 = 21

Reorder the terms for easier multiplication:
4x(2 + x) = 21
(2 * 4x + x * 4x) = 21
(8x + 4x2) = 21

Solving
8x + 4x2 = 21

Solving for variable 'x'.

Reorder the terms:
-21 + 8x + 4x2 = 21 + -21

Combine like terms: 21 + -21 = 0
-21 + 8x + 4x2 = 0

Factor a trinomial.
(-7 + -2x)(3 + -2x) = 0


Subproblem 1
Set the factor '(-7 + -2x)' equal to zero and attempt to solve:

Simplifying
-7 + -2x = 0

Solving
-7 + -2x = 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 + -2x = 0 + 7

Combine like terms: -7 + 7 = 0
0 + -2x = 0 + 7
-2x = 0 + 7

Combine like terms: 0 + 7 = 7
-2x = 7

Divide each side by '-2'.
x = -3.5

Simplifying
x = -3.5

Subproblem 2
Set the factor '(3 + -2x)' equal to zero and attempt to solve:

Simplifying
3 + -2x = 0

Solving
3 + -2x = 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 + -2x = 0 + -3

Combine like terms: 3 + -3 = 0
0 + -2x = 0 + -3
-2x = 0 + -3

Combine like terms: 0 + -3 = -3
-2x = -3

Divide each side by '-2'.
x = 1.5

Simplifying
x = 1.5
Solution
x = {-3.5, 1.5}

See similar equations:

| P=1/2xyz | | 12k-1-8k=-12+4k | | 43-x=7 | | 1-20n=-20n+1 | | 5(2h+3)=5(h-3) | | 3-18t=-18t+3 | | 14d+10+2d=10+16d | | 3(x+8)=24+3x | | -8-6q=-5q-10 | | X^2-250/x | | -3j+9=-5j-7 | | 2+f=f-1 | | 1/3x^4-2x^3 | | 10p+2=2+10p | | -10-3h=-3h-10 | | 7/5a=-14/3 | | -3+3r=10+3r | | -8w=-5-9w | | -2t+5= | | -24.226674+0.1x=-1.93(1-4.2x) | | 10-x+y+10=40 | | -12+12x-3x^2=0 | | 2x^2+x=420 | | (9/4y)^3*y^2 | | 3/16(x)=150 | | 3/16x=150 | | -3/8u=18 | | 25000-1200y=x | | 6(2x+4)=2(3x+6) | | 6(2+4)=2(3x+6) | | 6(2+4)=(3x+6) | | 1.49(w-4.3)=14.82 |

Equations solver categories