Question

Please simplify no. 12) i)

Answer 1

$(3x - 1) {}^{2} - (3x - 2)(3x + 1)$

$9x {}^{2} - 6x + 1 - (3x - 2)(3x + 1)$

$9x {}^{2}- 6x+1 -({9x}^{2}+3x-6x-2)$

$9x {}^{2} - 6x + 1 - (9x {}^{2} - 3x - 2)$

$9x {}^{2} - 6x + 1 - 9x {}^{2} + 3x + 2$

$- 3x + 3$

Answer 2

Answer:

-3x+3

Step-by-step explanation:

Just expand the quadratics ,

A trick would be to apply (x+a)(x+b) = x^2 + (a+b)x + ab

and (x+a)(x+a) = x(x) + 2ax + a(a)