and
(f+g)(x) =
combining like terms gives you answer choice B
A: -5/18
B:1 and 16/35
C: 7/30
D: 7/8
Multiplication because you are going to multiply the recipe by 2 to double it.
When you make the product of a binomial of the kind x + a times other binomial that is of the kind x - a, you obtain another binomial (not a trinomial), so any example with that form will be a counterexample that disproves the conjecture:
(x + a) * (x - a) = x^2 - a^2
For example, (x +3) * (x - 3) = x^2 - 9. So, not always the product of two binomials is a trinomial.
