Question

Factoring Question: Factor the following
a)8a^2-2ab-21b^2

Answer 1

(2a+3b)(4a-7b)

Answer 2

How did you do that ?

Answer 3

?

Answer 4

on sec ..

Answer 5

ok

Answer 6

If you can't factor this kind of quadratic, omit the second variable (but remember to put it back at the end) and proceed the same way as above
8a^2 - 2a - 21 = 0
a = -3/2, 7/4
(a + 3/2) (a - 7/4)
8 (a + 3/2) (a - 7/4)
(2) (4) (a + 3/2) (a - 7/4)
(2a + 3) (4a - 7)
*(2a + 3b) (4a - 7b)*

Answer 7

How are you getting -3 and 7

Answer 8

I was taught to multiply the a by the c

Answer 9

then find two numbers that add to the "b" and multiply to c and a together

Answer 10

well i was taught like this either way the answer is the same :)

Answer 11

Wait

Answer 12

if we do it my way what two numbers multiply to -168 and add to -2?

Answer 13

i can't figure that part out

Answer 14

-14*12=-168
-14+12=-2

Answer 15

Oh, how did you find that so fast. I can't figure out numbers when they are so inlarged

Answer 16

lol you just have to pratice and study your times tables :)

Answer 17

aha yeah truee, thanks again very much i appreciate the help

Answer 18

You Are Very Welcome :)

Answer 19

Do you mind trying to do another factoring equation that is a bit different?

Answer 20

If you are busy it is okay.

Answer 21

Yah im about to leave some where sorry

Answer 22

Okay thats alright good bye

Answer 23

bye but thanks for the medal

Answer 24

No thank you for the help :)