Question

Solve 3x2 = 12x.
@hartnn

Answer 1

ok, first subtract 12x from both sides, what u get ?

Answer 2

-9x^2 = x

Answer 3

it doesn't work that way,
3x^2 and 12x are not like terms, so u cannot combine them
subtracting 12x from both sides will give you
\(3x^2-12x=0\)
got this ?

Answer 4

Oops >_< Okay

Answer 5

then factor out 'x' from
\(3x^2-12x\)
can you ?

Answer 6

Basically factor it all, or just the x's?

Answer 7

3x2 -12x=0
3x(x-4)

Answer 8

you can factor 3x from
3x^2-12x

like for example, factoring 5x from 15x^2-25x will give you 5x (3x-5)

Answer 9

you understand factoring ?

Answer 10

Yes, I'll do that right now.

Answer 11

3x ( x-4)

Answer 12

Yess :p

Answer 13

yeah, so
3x(x-4) = 0
gives
3x=0
x-4 = 0
what 2 values of x you get from these ?

Answer 14

Don't worry, I saw your answer, but I still worked it out as well @uri

@hartnn -4 and 3?

Answer 15

3x= 0 gives you x= 0, right!

x-4 = 0
adding 4 on both sides,
x-4+4 = 0+4
x= +4

got these ?

Answer 16

Yes, thank you!

Answer 17

welcome ^_^