The expression $2z^2+13z+21$ can be written as $(z + a)(2z + b),$ where $a$ and $b$ are integers. What is $2a + b$?
Question:
The expression $2z^2+13z+21$ can be written as $(z + a)(2z + b),$ where $a$ and $b$ are integers. What is $2a + b$?
Answer:
Let's think step by step.

user
13
The expression $2z^2+13z+21$ can be written as $(z + a)(2z + b),$ where $a$ and $b$ are integers. What is $2a + b$?
train