Thread: Factorise

Factorise y4 - 3y^2 - 4. Hint. Let z = y^2

Originally Posted by AJShaw

Factorise y4 - 3y^2 - 4. Hint. Let z = y^2

if , your problem becomes:



Try factorizing now

I am just learning factorising. Is it:

z^2-3z-4

z^2-3z-4

z-3-4

z-7

If not right, can you show me how to do it please?

Originally Posted by AJShaw

I am just learning factorising. Is it:

z^2-3z-4

z^2-3z-4

z-3-4 : How did you get this?

z-7

If not right, can you show me how to do it please?

What you have done is not right. Please review your class notes/book about factorizing!











Now substitute the value of z that you had assumed at the beginning of the quesiton.