1+4=5
2+5=7
3+6=9
8+11=19
hope this helped:)
Answer:
+2
Step-by-step explanation:
=> 
=> 
<em>Arranging it in descending order</em>
=> 
<u><em>So, the coefficient of x² in this expression is +2</em></u>
Its 12 because 4 times 12 is 48 if you add 7 to 48 you get 55