Expand and simplify: (x - 5y) (x + 3y)
o x2 + 2xy – 15y2
ox2 - 2xy - 15y2
o x2 + 2xy + 15y2
o x2 - 2xy + 15y2

Given that (x-3) is a factor of f(x)=x^3+ax^2-x-6, find a and hence the number of real roots or the equation f(x)=0

Given the function f(x) = 3x + 1, evaluate f(a + 1). a. 3a + 1 b. a + 2 c. 3a + 4

Which question is not a good survey question? a.don't you agree that the financial crisis is essentially over? 63on average, how many hours do you sleep per day? c. what is your opinion of educational funding this year? d.are you happy with the availability of electronic products in your state?