Since it is a cubic polynomial, it must have three roots, but they only give you two! That is okay, because one of them is complex (remember complex roots come in conjugate pairs). So that gives you the three roots x= -3; 5i; and -5i. This means that you multiply together (x+3); (x-5i); and (x+5i) to find the polynomial!
Number 48...how do I set that up?
ReplyDeleteSince it is a cubic polynomial, it must have three roots, but they only give you two! That is okay, because one of them is complex (remember complex roots come in conjugate pairs). So that gives you the three roots x= -3; 5i; and -5i. This means that you multiply together (x+3); (x-5i); and (x+5i) to find the polynomial!
ReplyDeleteHope this helps
NS