# Math Help - Expanding/Factoring Q. 2

1. ## Expanding/Factoring Q. 2

Sorry, yet another one.

Is it possible to find the unknown value in the following expression. Explain

(a+3)(a+__)=a²+10a+6

Thank you again.

2. Originally Posted by Constance
Sorry, yet another one.

Is it possible to find the unknown value in the following expression. Explain

(a+3)(a+__)=a²+10a+6

Thank you again.
No, assume $a=-3$ then the left hand side is 0 because $a+3=0$ regardless of what the missing number is it will still have to be zero. Yet, the right side would not.
Q.E.D.