factor 4x^2-17x+4 by grouping

Question

superhelp101 · Answer

@vishweshshrimali5  do you think you could help meh?

vishweshshrimali5 · Answer

$$\large{4x^2 - 17 x+ 4}$$

$$\large{= 4x^2 - 16 x - x + 4}$$

$$\large{= 4x(x - 4) - (x-4)}$$

Can you solve after this ?

vishweshshrimali5 · Answer

Any doubt in any step I wrote above ?

tkhunny · Answer

I so hate "factor by grouping".  This method is rarely of any value whatsoever - except in a section entitled "factor by grouping".  It usually helps me to solve some other way so I can see what "grouping" might be useful.

superhelp101 · Answer

yep! (4x-1)(x-4). But I feel there's something wrong

vishweshshrimali5 · Answer

Well nothing wrong I think :)

vishweshshrimali5 · Answer

$$\large{(4x-1)(x-4) = 4x^2 - 16x - x + 4}$$

$$\large{= 4x^2 - 17x +4}$$

Correct !

superhelp101 · Answer

You're right! :) but i am supposed to get: |dw:1406173267671:dw|