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