Question

Solve..

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

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

Answer 1

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

Answer 2

huh?

Answer 3

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

Answer 4

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

Answer 5

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

Answer 6

yeh i rectified that in one of my replies

Answer 7

just factor it