algebra 2 q?

(2x^3-5)^2

i got 4x^6-20x^3+10

my teacher marked it correct,then crossed it out and put -1

is it 4x^9??

idk help! thank:)

Top 3 Answers

A few days ago

Eric212

Favorite Answer

(2x^3-5)^2=

4x^6-20x^3+25

You took 5^2 and got 10, not 25.

Close, but not correct.

A few days ago

Ed S

4x^6-20x^3+25 (you put 10–it is 5 times 5 not 2 times 5)

A few days ago

joelzme

4x^6-20x^3+25

-5*-5=25 you added and should have multiplied the last 2.

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