Question

subtract ? 4√5 - 9√20

Answer 1

You'll want to simplify \(\sqrt{20}\) before you try to add.

Answer 2

\[-14 \sqrt{5} \]\[4\surd 5-9\surd 20 \]\[4\surd 5-18 \sqrt{5} \]\[-14 \sqrt{5} \]

Answer 3

what ? to both of your responses. pol im subtracting. and robt whered you get 14 ?

Answer 4

4 apples take away 18 apples leaves negative 14 apples.

Answer 5

whered 18 come from?

Answer 6

Simplifying \(9\sqrt{20}\) like I said:

\[9\sqrt{20} = 9 \sqrt{4\cdot 5} = 9 \cdot\sqrt{4} \cdot \sqrt{5} = 9\cdot 2 \cdot \sqrt{5} = 18 \sqrt{5}\]

Answer 7

\[9\sqrt{20}=9\sqrt{2*2*5}=9*2\sqrt{5}=(18)\sqrt{5} \]I was working in parallel with polpak.