How do you factor 4x2 – 4x – 48 ?

Question

parthkohli · Answer

Hey there! Factoring out the 4 is a good start.

$ \color{Black}{\Rightarrow 4(x^2 - x - 12) }$

parthkohli · Answer

If you notice, 
-4x + 3x = -x
-4x * 3x = -12x
Split the middle term.

$ \color{Black}{\Rightarrow 4(x^2 - 4x + 3x - 12x) }$

parthkohli · Answer

And then you just group.

$ \color{Black}{\Rightarrow 4(x(x - 4) + 3(x - 4)) }$

$ \color{Black}{\Rightarrow 4(x +3)(x - 4)}$

Did you get it? 0mgl0la

anonymous · Answer

It is quite simple 
4(x^2-x-12)
=4(x^2-4x+3x-12)
=4x((x-4)+3(x-4))
=(4x-3)(x-4)

anonymous · Answer

@ParthKohli  Can you please look at the questions I have posted need help exam on 9th

parthkohli · Answer

I answered that to you in chat, @ipm1988

anonymous · Answer

4x^2-4x-48
(2x+6)(2x-8)....  :-)

anonymous · Answer

So, what are the factors..?

parthkohli · Answer

Hey! Scroll up :)

anonymous · Answer

(4x-3)(x-4) ?

parthkohli · Answer

And, @ipm1988 I believe that it is (4x + 3)(x - 4) ;)

parthkohli · Answer

Actually, it is $4(x + 3)( x- 4)$

anonymous · Answer

Oh, ok.

anonymous · Answer

@ipm1988 ,,can u get -4x in that factor??i think we can't.. just confusing

anonymous · Answer

@ParthKohli you are right i made a mistake sorry i was not able to see your message in chat what did you wrote

parthkohli · Answer

I am just 12, so I can't do Calculus :(

anonymous · Answer

no that's ok,,i'm just confuse by your answer,, :)

anonymous · Answer

my answer is wrong