urgent helpp!!!!! (1 Viewer)

[iJimmy]

hey guys my brain just blew up and i forgot how to do this: factorise

25y - y^3

 

[iJimmy]

BUMP


Hsc

 

[Hoggy70]

y(25-y^2)
=y(y-5)(y+5)

 

[Smile12345]

hey guys my brain just blew up and i forgot how to do this: factorise

25y - y^3

Take a y out the front as it is common to both...

So y(25 - y^2)

Now we now in the brackets is (5 - y)(5 + y) - using difference of two squares.

So the answer is y(5 -y)(5 + y)...


(Awe, I was beaten to it...)

 

[HeroicPandas]

Going from 25 - y^2 to (5-y)(5+y) is using difference of two squares (just to let the OP know)

 

[Smile12345]

Going from 25 - y^2 to (5-y)(5+y) is using difference of two squares (just to let the OP know)

Yup, added it in.

 

[iJimmy]

thx guys