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# solve 3x(x+2)=0 watch

1. ok so i got x=-2

what do i do with the 3x? or is there only one solution?

when i come across equations looking like that with one set of brackets i get confused
2. Presumably you got x = -2 because this is the value that makes (x + 2) equal to zero.

If you think of the equation as (3x)(x - 2) = 0, you have found the value of x that makes the second bracket equal to zero.

Now - what is the value of x that makes the first bracket equal to zero?
3. The second solution is x = 0. If 3x(x+2) = 0, then either x+2=0 or 3x=0; the only way two things multiplied together can equal zero is if one of them is zero.

(Original post by ihatePE)
ok so i got x=-2

what do i do with the 3x? or is there only one solution?

when i come across equations looking like that with one set of brackets i get confused
4. -2 and 0

Equations looking like that always have at least one answer as 0
5. x=0.
6. if you draw a graph of y = 3x( x + 2 ) you will see that it crosses the x axis at two points.
7. (Original post by Pangol)
Presumably you got x = -2 because this is the value that makes (x + 2) equal to zero.

If you think of the equation as (3x)(x - 2) = 0, you have found the value of x that makes the second bracket equal to zero.

Now - what is the value of x that makes the first bracket equal to zero?
(Original post by Jasaron)
The second solution is x = 0. If 3x(x+2) = 0, then either x+2=0 or 3x=0; the only way two things multiplied together can equal zero is if one of them is zero.
of course, thanks, <3

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