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#