Question

factor
3y^2-4y-15

Answer 1

3 * 15 = 45
factor 45
and pick out 2 numbers whose product is -15 and sum = -4 ( 3 must also be involved in calculation)

factors will be of the form
(3x + a )(x + b )

Answer 2

45 = 3 * 3 * 5

Answer 3

oops - i should have said -45 = -( 3*3*5*1)

Answer 4

sorry - hope i havent confused you by not including the minus sign
factors are
(3x + 5)(x - 3)