Question

help 8b^2-50. Factor
do i do it 8(b^2-50)
or 8(b-25)(b+25) or
8(b-5)(b+5) OR none

Answer 1

none
if you take out the 8 you have to factor it out of BOTH terms
50/8 is not a perfect square, so try to factor out 2 instead
remember to factor it out of both terms first

Answer 2

(10a+50)=10(a+5) for example

Answer 3

25^2 not= 50

Answer 4

ok so 2(b+25)^2?

Answer 5

why did the ^2 move outside?

Answer 6

\[b\sqrt{8}\pm \sqrt{50}\]

Answer 7

lol I m not sure he was nt happy inside????ok so keep 2 inside?

Answer 8

yeah
and keep it negative
and b should still have a 4 next to it

Answer 9

(2b+25)(2b-25)

Answer 10

25^2 not= 50 still

Answer 11

no w8

Answer 12

...and the 2 that you pulled out needs to stay next to the parentheses
it can't just disappear

Answer 13

not to mention the other fauxpauxs

Answer 14

ok thats why im on here armi have patience grasshopper

Answer 15

2(4b+25)(b-25)

Answer 16

\[(a^2-b^2)=(a+b)(a-b)\](just to make sure it's on the screen)

Answer 17

but 8 has no sq root you see where im stuck

Answer 18

let's back up...
8 and 50 are not perfect squares, but they are close
divide each by 2 and they will be, so we factor out a 2:\[8b^2-50=2(4b^2-25)\]that's the first step
now what is a and b in your particular problem

Answer 19

4 and 25?

Answer 20

no, that is a^2 and b^2
so what are a and b then?

Answer 21

I DONT KNOPWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW im sorry im challenged mathematically speaking

Answer 22

I dont have a clue. I thought a and b was 8 and 25 what else is there to choose from?

Answer 23

actually sorry my notation is confusing you perhaps
the difference of squares formula is\[x^2-y^2=(x-y)(x+y)\]your formula is\[8b^2-50=2(4b^2-25)=2((2b)^2-5^2)\]so what I call x and y in the formula are 2b and 5 in your particular problem

Answer 24

No its not you it's me. you have been really helpful thank you. I will apply it to the next equation. thanks<3

Answer 25

It makes sense when you break it down like that<3

Answer 26

welcome
you know this one's not done though, you still need to apply the actual formula for difference of squares
I will leave that to you

Answer 27

thanks tur.