<span>-7 x (-9) = +63
because if we multiply negative by negative we obtain +</span>
Answer:
378$
Step-by-step explanation:
The product would expand to

This is a trinomial, and the only way to make it a binomial is to cancel out a coefficient using our variable
.
So, we can cancel either the linear term or the constant term.
In the first case, we require

In the second case, we require

But
must be a non-zero rational number, so this solution is not feasible.
Answer:

Step-by-step explanation:

reflexive postulate of equality