Solve..

(3x-1)^2-2(3x-1)

I know the answer is 9x^2-12x+3
But, I don't see why..

Question

Solve..

(3x-1)^2-2(3x-1)

I know the answer is 9x^2-12x+3 
But, I don't see why..

anonymous · Answer

substitue (3x-1) with say x adn solve the quadratic

anonymous · Answer

huh?

anonymous · Answer

i mean simplyfy... so it would become x^2-2x... which becomes x(x-2) ... then substitute back in (3x-1) and simplyfy

campbell_st · Answer

ok... just expand or distribute each part 

$$(3x - 1)^2 = 9x^2 - 6x + 1$$

and 

$$2(3x - 1) = 6x - 2$$

finding the difference gives

$$(3x -1)^2 - 2(3x -1) = 9x^2 - 6x + 1 -(6x - 2)$$

all you need to do is collect the like terms

campbell_st · Answer

@aceace I think the question should have been simplify.... as this is an expression so it can't be solved.

anonymous · Answer

yeh i rectified that in one of my replies

anonymous · Answer

just factor it