need help with understand factorization

[solemn edge]

half of these are notes and the other half is my wrong answers

i got these two wrong

[polar creek]

Your only mistake in the second one is the missing negative sign next to 9 after taking a common factor

[solemn edge]

yeah i realized that after i got it wrong

i keep getting the things wrong. even if its by small things

[polar creek]

Yeah that well disappeared with practice if you still have a problem with the first one tell me

[solemn edge]

like if i open up a past paper real quick. i'll get an equation and do it real quick

1. 3a^3b-6a^2b+9ab
2. 4x^2-81
3. (a-b)+c(b-a)
4. 3x^2-12x-36

answer 1: 3a(1a^b-3ab+3b)

2. (2x+9)(2x-9)

[polar creek]

Is it 3a^(3b) or 3b(a)^(3)?

[solemn edge]

i thi

[polar creek]

Oh ok I think you forgot the 2 in the a^ power

[solemn edge]

Oh oops

[solemn edge]

well i answered this. i didnt use waht i typed here

idk if my answer is correct, let me check

no i got it wrong

i didnt realize they all had b

[polar creek]

Also you switched 2 for 3 next to a^2b

[solemn edge]

yes ik

its just the question anyway

[polar creek]

Yeah it's no problem

[solemn edge]

i got this one right

[polar creek]

Yes

[solemn edge]

idk how to answer question 3

4: 3(1x^2-4x-12)

[polar creek]

Hint:Notice you can take a negative 1 as a common factor then there comes another common factor you can take

[polar creek]

This one is correct

[solemn edge]

all i know is im supposed to change it to a negative

idk how to do the rest

i think swap the last term around to change it to a negative

[polar creek]

Yes, another hint: ||Imagine (a-b) as one term take it as a common factor||

[solemn edge]

oh

OHH

(a-b)(1-c)

?

[polar creek]

Yes

[solemn edge]

ah

alright

let me check the memo

it said i got 4 wrong

4: 3(1x^2-4x-12)
this one

[polar creek]

Yeah I thought they wanted only common factors

[solemn edge]

do you know how they got to (x-6)(x+2)?

ik they got x^2 cuz the square root

idk how they got the 6