Question

Factorising and dividing $a^2+7a+10$ by $(a+5)$ gives:

• A. $1$
• B. $a+1$
• C. $2$
• D. $a+2$

Answer 1

The correct option is D

$a+2$

$a^2+7a+10=a^2+5a+2a+10=a(a+5)+2(a+5)=(a+2)(a+5)\text{Dividing this by}(a+5)\text{gives}(a+2)$.