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MATH / The expression 2z²+13z+21 can be written as (z+a)(2z+b), where a and b are integers. What is 2a+b?

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problem

The expression 2z2+13z+212z^2+13z+21 can be written as (z+a)(2z+b),(z + a)(2z + b), where aa and bb are integers. What is 2a+b2a + b?
Plain-text mathematical notation (without MathML)
The expression 2z²+13z+21 can be written as (z+a)(2z+b), where a and b are integers. What is 2a+b?
Original LaTeX notation
The expression $2z^2+13z+21$ can be written as $(z + a)(2z + b),$ where $a$ and $b$ are integers. What is $2a + b$?

level

Level 2

type

Algebra

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Source and history

task_id
41291e1f-4b6b-537f-ac5a-700f48c92faa
task_key
algebra--test--41291e1f-4b6b-537f-ac5a-700f48c92faa
task_revision_id
1
config / split
algebra / test

Official source

initial import