Question

Please Help, or Teach me.
i miss this lesson today and
this was the given assignment.



1.) 2a+b a+4b a-7b
___________ - ____________ - ____________
a^2-3ab+2b^2 a^2-4ab+3b^2 a^2-5ab+6a^2



2.) 6m 2n
____________ - ___________
m^2+5m+6 m^2+6m+9


3.) m+2 m
_____ - _____
3m+15 5m+25

Thanks in Advance

Answer 1

r u familiar with factorising?

Answer 2

yes i am

Answer 3

good:)
can u factorise a^2-3ab+2b^2?

Answer 4

is it 2ab^2?

Answer 5

Nope:(
Can u tell me two factors of 2 such that their sum is -3?

Answer 6

(x-2)(x-1)?

Answer 7

a^2-3ab+2b^2
the factors of 2 whose sum is -3 are -1 nd -2.
split the middle term -3ab using this. then u will get
a^2-2ab-ab+2b^2
=a(a-2b)-b(a-2b)
=(a-2b)(a-b)
Is it clear?

Answer 8

so the factor of the a^2-4ab+3b^2 is -3 -1 also
a^2-3ab-ab+3b^2
=a(a-3b)-b(a-3b)
=(a-3b)(a-b)?

Answer 9

a^2-5ab+6a^2 = (a-2)(a-3)
i dont know next

Answer 10

can u help me with any number there, so that i can answer the others by myself.

Answer 11

good:)
so
a^2-3ab+2b^2=(a-2b)(a-b)
a^2-4ab+3b^2=(a-3b)(a-b)
a^2-5ab+6a^2 = (a-2)(a-3)

Answer 12

can u find thw l.c.m of (a-2b)(a-b), (a-3b)(a-b) and (a-2)(a-3)?

Answer 13

i dont know how.

Answer 14

may i ask if this is correct a^2-5ab+6a^2 = (a-2)(a-3) because i didnt split it yet

Answer 15

nope:( sorry i didnt notice it.
if it is a^2-5ab+6b^2, then
a^2-5ab+6b^2= (a-2b)(a-3b)

Answer 16

so is it all right if a^2-3ab+2b^2=(a-1b)(a-2b)
a^2-4ab+3b^2=(a-1b)(a-3b) ?

Answer 17

yup:)

Answer 18

ajprincess,
can you solve any number there then
ill do the rest so that i can follow.
because its 2am here and i need to sleep
thanks for your help btw

Answer 19

is it a^2-5ab+6a^2? or a^2-5ab+6b^2?

Answer 20

its written a^2-5ab+6a^2? but i think it b