Factoring i do not know how to factor

(if f(x)=4x^2 and g(x)=x+1, find (f o g)(x)

The multiplication property of zero states that the product of any number and 0 is 0. what must be true about either a or b to make ab=0

Given: x + y = 6. if xe (-15, -6, -1), then which of the following sets of ordered pairs are solutions? © {(-15, -21), (-6, -12), (-1, -7)} [(-15, 21), (-6, , 7)} {(-15, 21), (-6, 12), (-1, -7)}