Question

8√45 - 3√80
simplify

Answer 1

45=9 * 5
80= 16 * 5

you know that 9 and 16 are perfect squares.

Answer 2

45=9 * 5
80= 16 * 5

you know that 9 and 16 are perfect squares.

Answer 3

so it would be 9√5 - 16√5? then simplify?

Answer 4

\(\Large\color{blueviolet }{ \sf \sqrt{45} =\sqrt{9 \times 5 }=\sqrt{9 } \times\sqrt{ 5 }=3\sqrt{ 5 }}\)

\(\Large\color{blue }{ \sf \sqrt{80} =\sqrt{16\times 5 }=\sqrt{16 } \times\sqrt{ 5 }=4\sqrt{ 5 }}\)

\(\Large\color{green}{ \sf 8\sqrt{45} -3\sqrt{80} =8~(3\sqrt{ 5 })-3~(4\sqrt{ 5 })}\)

finish it off please.

Answer 5

i dont understand how you got the 3rd part

Answer 6

the third part, is the begging on how to simplify based on what we know from blue and purple.

Answer 7

i dont understand what the final answer would be

Answer 8

\(\Large\color{red}{ \sf 8~(3\sqrt{ 5 })-3~(4\sqrt{ 5 })=}\)

\(\Large\color{red}{ \sf 24\sqrt{ 5 }-12\sqrt{ 5 }= ?}\)

Answer 9

12√5

Answer 10

Yes, it would be 12√5

Also, I want to make your life easier (you probably don't know this)

1) click ALT and hold it
2) click 2 5 1
3) release the ALT

try it.

Answer 11

i just copy paste it lol

Answer 12

but click the 2 5 1 on your keyboard on the right, NOT the ones below F1 F2 ..

Answer 13

i got it but i usually just copy paste it

Answer 14

thanks man you've helped me alot

Answer 15

Well, it's certainly easier :) you welcome.