How do you simplify $4a(5a^2-4)+9a$ ?

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Answer 1 · 2017-08-22T14:57:22

See a solution process below:

First, multiply each term within the parenthesis by the term outside the parenthesis:

$color(red)(4a)(5a^2 - 4) + 9a =>$

$(color(red)(4a) * 5a^2) - (color(red)(4a) * 4) + 9a =>$

$20a^3 - 16a + 9a$

We can now combine like terms:

$20a^3 + (-16 + 9)a$

$20a^3 + (-7)a$

$20a^3 - 7a$

How do you simplify 4a(5a^2-4)+9a4a(5a^2-4)+9a?